Justified True Belief

Mapping the Landscape of Good Reasons for the Truth of Christianity

Natural Theology

Arguments for Theism

Cosmological

Arguments from Causation

The Kalam Argument

Leibniz' Contingency Argument

(P1) Everything that exists has an explanation of its existence, either in the necessity of its own nature or in an external cause. + This premise expresses a fundamental principle about reality: things don't just exist for no reason at all. There is always some explanation for why something exists rather than not existing. (1) There are two basic kinds of explanation for existence. - Some things, if they exist at all, exist necessarily. They cannot fail to exist. Their explanation lies in their own nature. - Other things exist contingently. They could have failed to exist, and their explanation lies in something outside themselves that caused them to exist. (2) Mathematical truths provide examples of necessary existence. - The truth that 2+2=4 holds in every possible scenario. It cannot be otherwise. - If numbers exist as abstract objects, they exist necessarily. The number 7 doesn't depend on anything to bring it into being. It simply is. (3) Ordinary physical objects clearly exist contingently. - You did not have to exist. Your parents could have never met. - The Earth did not have to exist. The solar system could have formed differently. - Stars, galaxies, and planets all came into existence and could have failed to do so. (4) We have a strong intuition that existing things have explanations. - Imagine finding a translucent ball in the woods. You would naturally wonder: where did it come from? How did it get here? - Simply increasing the size of the ball (making it as big as a house, or a planet, or even the entire universe) doesn't remove the need for an explanation. - The question "Why does this exist?" remains legitimate no matter how large the object is. (5) A note on the version of this principle used here. - Leibniz's original formulation (in "On the Ultimate Origination of Things," 1697) stated that nothing takes place without a sufficient reason, by which he meant the very strong claim that every fact about the world, down to its smallest detail, has a complete explanation. - Some philosophers have argued that this stronger version leads to troubling consequences (see Defeater 9). - The version used in this argument is deliberately more modest, following the formulation developed by contemporary philosophers like Alexander Pruss and William Lane Craig: existing things have explanations either in their own nature or in an external cause. - This qualified version does not require that every detail of the world be deterministically necessitated. It only excludes truly inexplicable brute existence: things that exist for literally no reason at all. Therefore, it is rational to accept that everything that exists has an explanation of its existence, either in the necessity of its own nature or in an external cause.

(P2) The universe is a contingent reality: it does not exist by a necessity of its own nature. + (1) The universe is the totality of all physical reality. - By "universe" we mean everything physical: all space, all time, all matter, all energy, and the laws that govern them. - This includes every galaxy, every star, every particle, from the beginning of the Big Bang to the present moment and beyond. (2) We can conceive of the universe not existing or being radically different. - It seems entirely possible that there could have been no physical universe at all. We can imagine absolute nothingness: no space, no time, no matter, no energy. - We can also conceive of a universe with different laws of nature. Imagine gravity being twice as strong, or the speed of light being different, or matter not existing at all. - When we honestly ask whether the universe had to exist, the answer seems clearly no. Nothing about quarks, electrons, or space-time geometry seems to demand: "This must exist necessarily." What can be coherently conceived as possibly non-existent or different is good evidence of contingency, not necessity. A brief methodological note: we are using conceivability here as evidence for possibility, not as strict proof. But even if conceivability alone were insufficient, the remaining evidence, namely the universe's temporal beginning, its specific contingent properties, and its finely calibrated initial conditions, independently supports the conclusion that the universe is contingent rather than necessary. (3) Scientific evidence suggests the universe began to exist with very specific conditions. - Modern cosmology indicates the universe had a beginning approximately 13.8 billion years ago. - The early universe had extremely specific initial conditions (very low entropy, precise energy distribution). - A beginning and finely calibrated initial conditions point toward contingency rather than necessity. (4) If the universe were necessary, every feature of it would be necessary. - A truly necessary being cannot be different in any possible world. It must be exactly as it is in all possible scenarios. - But the universe appears to have countless contingent features: the number of galaxies, the precise values of physical constants, the distribution of matter. - This abundance of contingent features strongly suggests the universe as a whole is contingent. Therefore, the universe does not exist by the necessity of its own nature. It is a contingent reality that could have failed to exist.

(P3) If the universe has an explanation of its existence, that explanation is a necessary, non-physical, eternal, immaterial cause: God. + (1) The explanation cannot be another contingent physical thing. - The universe is the totality of physical reality. Any physical thing would already be part of the universe. - You cannot explain the whole in terms of one of its parts. That would be like trying to explain why a library exists by pointing to one of the books inside it. (2) The cause must transcend space, time, and matter entirely. - Space, time, and physical matter are all features of the universe that came into being with it. - The cause of the universe must therefore lie completely outside of them. It must be timeless, spaceless, and immaterial: not made of matter or energy, not located anywhere in physical reality, and not bound by the timeline of the universe it creates. - Think of an author existing outside the story she writes. The author is not a character inside the narrative; she exists on a different level altogether, shaping the world of the story without being subject to it. (3) The cause must be metaphysically necessary. - Since the universe is contingent and requires an external explanation, what is that explanation? - If the external cause is itself contingent, we simply push the question back: what explains that cause? - To avoid an infinite regress of contingent causes, we must eventually arrive at a being that exists necessarily: a being whose existence is explained by its own nature. - This necessary being is the ultimate foundation of all contingent reality. (4) The only viable candidate is a personal mind. - At this point we can sketch a profile of what the cause of the universe must be like: metaphysically necessary (self-existent), immaterial (not made of physical stuff), eternal (outside of time as we know it), spaceless (not located within the physical universe), and enormously powerful (capable of bringing all physical reality into being from nothing). The question is: what kind of being actually fits this description? - There are really only two candidates philosophers have seriously proposed: abstract objects and minds. - Abstract objects such as numbers, sets, and mathematical truths are often considered necessary, immaterial, and timeless. But they carry a decisive disqualification: they are causally inert. The number 7 doesn't do anything. It doesn't create, it doesn't act, and it doesn't choose. The number 7 couldn't bring a universe into existence any more than the concept of "triangle" could draw you a picture. Abstract objects simply belong to the wrong category to serve as causes of anything. - That leaves minds. An unembodied mind, meaning a personal agent existing without a physical body, is the only kind of entity we know of that is both immaterial and causally active. Every time you decide to raise your hand, your mind causes something physical to happen. Minds are already in the business of causing things. They are the one kind of entity we know from the inside that can act, choose, and bring new states of affairs into being. - But why must the cause be personal specifically? Here the argument becomes especially illuminating. The cause must explain not just why the universe exists, but why it began to exist at a particular "moment" rather than always existing alongside its cause. If the cause were an impersonal, necessary mechanism like a chemical reaction that automatically proceeds whenever conditions are right, it would produce its effect whenever those conditions were present. But if the cause is eternal and changeless, those conditions were always present. So why didn't the effect (the universe) exist eternally too? - The only resolution is a personal cause: a being who can freely choose to act. Think of someone sitting perfectly still in a room. Nothing forces them to move. But at a moment of their own choosing, they freely stand up, producing a new effect from an unchanged prior state. No external cause compelled the change; it was a free decision. Only a personal agent can produce a temporal effect (a universe with a beginning) from an eternal, changeless cause. - It is worth acknowledging that some philosophers challenge the move from "personal" to "God of classical theism." Perhaps the necessary mind is morally neutral, or perhaps multiple necessary minds are conceivable. These are fair follow-up questions. But they are answered by other arguments that build on this one. The fine-tuning argument suggests this Creator is rational and intelligent to a degree that staggers the imagination. The moral argument suggests this Creator is the source of objective goodness. The argument from consciousness suggests this Creator is supremely aware and rational. The contingency argument provides the indispensable foundation on which those further arguments build and enrich: a necessarily existing, immaterial, eternal, personal Creator. Each argument adds a piece; together they converge on a robust picture. - A necessarily existing, immaterial, timeless, spaceless, supremely powerful, personal mind is precisely what classical theism means by God. This is what we mean by God: a necessary, eternal, immaterial, supremely powerful, personal Creator of all contingent reality.

(P4) The universe exists. + The universe's existence is beyond dispute. Every thinker in every philosophical tradition agrees on this basic fact. The question before us is not whether the universe exists, but why. What explains the existence of this contingent, physical reality? Why is there something rather than nothing? With that question in view, the conclusion follows directly from P1 through P3.

(C) Therefore, the explanation for the existence of the contingent universe is a necessarily existing, eternal, immaterial, non-physical, supremely powerful, personal being: God.

Gottfried Wilhelm Leibniz, "On the Ultimate Origination of Things," in Philosophical Essays, trans. Ariew and Garber. Indianapolis: Hackett, 1989. Reasonablefaith.org. "Leibniz's Cosmological Argument and the PSR." https://www.reasonablefaith.org/writings/question-answer/leibnizs-cosmological-argument-and-the-psr Alexander Pruss, "The Leibnizian Cosmological Argument," in Craig and Moreland (eds.), The Blackwell Companion to Natural Theology (Blackwell, 2009), ch. 2. William Lane Craig, Reasonable Faith: Christian Truth and Apologetics, 3rd ed. Wheaton, IL: Crossway, 2008. Graham Oppy, Arguing About Gods (Cambridge University Press, 2006), ch. 5 on contingency arguments. Alexander Pruss, The Principle of Sufficient Reason: A Reassessment (Cambridge University Press, 2006). Timothy O'Connor, Theism and Ultimate Explanation: The Necessary Shape of Contingency (Wiley-Blackwell, 2012). Peter van Inwagen, Metaphysics, 4th ed. Westview Press, 2015. Richard Dawkins, The God Delusion. Houghton Mifflin, 2006. Baruch Spinoza, Ethics (1677), trans. Curley. Princeton University Press, 1994. Jonathan Bennett, A Study of Spinoza's Ethics. Hackett, 1984. Thomas Baldwin, "There Might Be Nothing," Analysis 56 (1996): 231–238.

+ Maybe the universe is just a brute fact. It exists with no explanation, and that's the end of the story.

1. Calling the universe a "brute fact" is giving up on explanation at the most important point. Throughout science and everyday life, we demand explanations. When something exists or happens, we ask why. To suddenly stop asking "why" at the level of the universe itself seems arbitrary. Think of it this way: if a police detective investigating a crime said, "The suspect's fingerprints are just there at the crime scene as a brute fact with no explanation," we would find this absurd. We'd demand an explanation for why those fingerprints are there. Similarly, the existence of an entire universe cries out for explanation. 2. "It's just a brute fact" works for smaller things but not for the universe. We would never accept "brute fact" as an answer for ordinary objects: - If you found a bicycle in your garage that wasn't there yesterday, "it's just there without explanation" would be unsatisfying. - If a new mountain appeared on the landscape overnight, "it's a brute fact" would be ridiculous. Why should we accept this answer when the object in question is the entire universe? Increasing the scale doesn't eliminate the need for explanation; it intensifies it. 3. Theism offers a better stopping point than naturalism. Every worldview must stop explaining somewhere. The question is: which stopping point is more reasonable? - Naturalism stops at: A contingent physical universe that just exists without explanation. - Theism stops at: A necessary being (God) whose existence is explained by His own nature. The theistic stopping point is more satisfying because: - A necessary being, by definition, doesn't need an external explanation. It exists by its own nature. - A contingent universe, by definition, could have failed to exist and thus calls for an external explanation. 4. The "brute fact" position undermines the foundations of rational inquiry. Science and philosophy are built on the assumption that things have explanations. If we allow "brute facts" at the most fundamental level, we undermine this entire enterprise. If the universe can exist as a brute fact, why not allow other brute facts everywhere? Why not say: - "Water freezes at 0°C as a brute fact with no explanation." - "The speed of light is what it is as a brute fact with no reason." The success of science depends on refusing to accept brute facts and seeking deeper explanations. We should apply the same principle to the universe itself. 5. The "brute fact" move abandons explanation precisely where it is most needed. The existence of a finely tuned, law-governed, life-permitting universe is in fact the most fundamental fact about reality, not a minor incidental detail. Treating it as inexplicable is not intellectual humility; it is a refusal to follow the question to its natural conclusion. The contingency argument invites us to press one step further and ask whether a better explanation is available. The evidence and the reasoning suggest that it is.

+ If everything that exists needs an explanation, then God needs an explanation too. If God doesn't need one, why does the universe?

1. The premise doesn't say "everything needs an external cause." Let's be precise about what the first premise actually says: "Everything that exists has an explanation of its existence, either in the necessity of its own nature or in an external cause." This allows for two types of beings: - Contingent beings: explained by external causes - Necessary beings: explained by their own nature (they cannot not exist) So the premise doesn't require that everything have a prior cause. It only requires that everything have some explanation. 2. God and the universe are fundamentally different types of beings. The argument gives us reasons to think: - The universe is contingent (it could have failed to exist) - Therefore, its explanation must lie outside itself in an external cause - God, by contrast, is proposed as a necessary being (He cannot fail to exist) - Therefore, His explanation lies in His own nature, not in an external cause Think of the difference this way: - A battery-powered flashlight needs an external power source (batteries). Remove the batteries and it stops working. - A mathematical truth like "2+2=4" needs no external support at all. It is simply true, necessarily and always, without depending on anything outside itself. - God is like the ultimate self-sustaining reality. Unlike a mere abstract truth, He is also a personal agent with causal power. He exists by His own nature, not propped up by anything external. 3. Necessary beings are self-explanatory. When we say God exists necessarily, we mean: - His non-existence is impossible - He exists in every possible world - It belongs to His very nature to exist This is a different kind of explanation than the kind contingent things have. The explanation is: "This being cannot not exist." That's a complete explanation, even though it's not an explanation in terms of a prior cause. 4. The "what caused God?" question misunderstands the logic of necessary existence. Asking "what caused God?" is like asking: - "What is north of the North Pole?" - "Who is the bachelor's wife?" - "What shape is colorless?" These questions contain category mistakes. They try to apply concepts to things where those concepts don't fit. Similarly, asking for the cause of a necessary, uncaused being is asking a question that doesn't make sense. By definition, a necessary being has no cause; it exists by its own nature. 5. Every worldview ends somewhere; theism ends at a better place. Both theists and atheists must have an ultimate stopping point in their explanations: - Atheist's stopping point: "The universe just exists as a brute, contingent fact." - Theist's stopping point: "God exists as a necessary being whose nature explains His existence." Which is more reasonable? The theist's stopping point is superior because: - It explains contingent reality in terms of necessary reality - It grounds everything in a being whose existence is self-explanatory - It doesn't require us to accept that something contingent (could fail to exist) just exists for no reason The atheist's stopping point leaves us with a puzzle: why does a contingent universe exist rather than nothing? The theist provides an answer: because a necessary God freely chose to create it.

+ The claim that everything has an explanation is just the Principle of Sufficient Reason, which many philosophers reject as too strong or even false.

1. The version used in this argument is modest and carefully qualified. The Leibnizian contingency argument doesn't use an overly strong version of the Principle of Sufficient Reason (PSR). It uses a modest version: "Everything that exists has an explanation of its existence, either in the necessity of its own nature or in an external cause." This is much weaker than saying "every fact has a complete deterministic explanation" or "there are no brute facts whatsoever." The modest PSR simply says: - Existing things don't pop into being for literally no reason - There is always some explanation for why something exists rather than not existing 2. The modest PSR is confirmed by all our experience. In every area of life, we assume that existing things have explanations: - If your car won't start, you look for a cause (dead battery, no gas, mechanical failure) - If a building exists, you assume someone designed and built it - If life exists on Earth, scientists seek an explanation for its origin We never encounter objects that simply pop into existence without any explanation whatsoever. The modest PSR is simply the generalization of this universal experience. 3. Rejecting the modest PSR leads to absurdity. If the modest PSR is false, then things can exist without any explanation. But consider the implications: - Why doesn't everything pop into existence without explanation? - Why don't bicycles, horses, and galaxies just appear uncaused? - Why is the universe the only thing that gets to exist without explanation? Without the PSR, we lose all ability to distinguish explained from unexplained existence. Science would be impossible if we allowed things to exist for literally no reason. 4. Critics usually reject the PSR for one specific case: the universe. Notice that critics of the PSR don't reject it across the board. They still use it everywhere else: - They demand explanations for events within the universe - They seek causes for the origin of life, the formation of stars, etc. - They only carve out an exception for the universe itself This looks like special pleading. If the PSR is valid everywhere else, why should we abandon it precisely at the point where it would lead to a theistic conclusion? 5. Alexander Pruss's "weak PSR" provides a principled middle ground. Perhaps the most sophisticated contemporary defense of the PSR comes from philosopher Alexander Pruss (The Principle of Sufficient Reason, Cambridge University Press, 2006). Pruss argues that we need only a "weak PSR": every contingent thing has an explanation, but that explanation need not necessitate the thing. A sufficient reason fully explains something without making it the only possible outcome. Think of a judge sentencing a defendant. The judge has genuine reasons for the sentence: the severity of the offense, prior record, and principles of proportional justice. Those reasons fully explain the decision; there is nothing arbitrary or mysterious about it. But the same judge, with the same reasons before her, could have sentenced differently. The explanation is genuine and sufficient without being compelled. God's free choice to create works the same way: it is a genuine sufficient reason that fully explains the universe's existence, without making the universe logically inevitable. This also addresses the strongest philosophical objection to the PSR, namely that it leads to necessitarianism (the view that everything must be as it is). See Defeater 9 for that objection treated directly. 6. The argument doesn't need the strongest version of PSR. Even if we grant there might be some brute contingent facts about the world (like which of two possible outcomes occurs in a quantum measurement), this doesn't undermine the argument. The contingency argument only requires: - Existing things (substances, objects, systems) have explanations - It doesn't require that every fact or every detail be explained So even modest versions of PSR are sufficient to support the argument. We don't need to accept the most ambitious forms that some critics attack. 7. Denying all versions of PSR is self-defeating. If we completely reject PSR in all its forms, we undermine our ability to trust any reasoning at all: - Why trust our reasoning processes if they might exist or operate for no reason? - Why think the laws of logic apply if there's no reason they do? - Why believe our sensory experiences correspond to reality if there's no reason they should? A complete rejection of PSR pulls the rug out from under rational inquiry itself.

+ Perhaps the universe itself is a necessary being. Then it wouldn't need an external explanation.

1. Necessary existence means the thing cannot possibly fail to exist or be different. To say something exists necessarily is to say: - It exists in every logically possible world - It cannot fail to exist - Its non-existence is not just improbable but impossible - Its fundamental nature cannot be different This is an extremely strong claim. Does the universe meet this standard? 2. The universe appears deeply contingent, not necessary. When we examine the universe, we find countless features that could have been different or absent: - The values of physical constants (gravity, speed of light, etc.) could have been different - The laws of nature could have been different - The distribution of matter and energy could have been different - The universe could have had more or fewer dimensions Think about it: can you imagine a world with no physical universe? Most people can. That suggests the universe is not necessary. Can you imagine the universe having different properties? Again, this seems possible. Physicists routinely model alternative universes with different parameters. If all these alternatives are coherently conceivable and scientifically modelable, the universe is contingent, not necessary. 3. Scientific evidence points to the universe's contingency. Several lines of evidence suggest the universe is contingent: - The universe began to exist: According to Big Bang cosmology, the universe had a beginning about 13.8 billion years ago. Things that begin to exist are contingent, not necessary. - The universe has low initial entropy: The early universe was in a highly ordered, low-entropy state. This is one configuration among vastly many possible configurations, suggesting contingency. - The universe is finely tuned: The constants and initial conditions are precisely calibrated for life. This suggests they could have been different. All of this points away from necessity and toward contingency. 4. No positive argument is given for the universe's necessity. Those who claim the universe is necessary typically offer no argument for this bold claim. They simply assert it as a way to avoid needing to explain the universe. But the burden of proof is on them. The default position is that physical, composite systems are contingent. To claim the universe is a unique exception requires genuine philosophical justification, not mere assertion. Claiming something is necessary in order to block an argument's conclusion is precisely backwards; conclusions should be established by evidence and reasoning, not assumed in advance to avoid unwelcome inferences. 5. Even the parts of the universe are obviously contingent. Consider the fundamental particles that make up the universe: - Quarks, electrons, and other particles came into existence at the Big Bang - They have properties (mass, charge, spin) that could have been different - We can coherently imagine different particles with different properties If the fundamental constituents of the universe are contingent, how can the universe as a whole be necessary? Think of it this way: if every brick in a wall is contingent (each brick could have failed to exist), how can the wall itself be necessary? 6. For a more sophisticated version of the "necessary universe" proposal, see Defeater 11. The philosopher Baruch Spinoza developed a fully worked-out philosophical system in which the universe itself is the one necessary substance. This is far more than a bare assertion and deserves its own careful treatment. Defeater 11 addresses Spinozistic necessitarianism directly and explains why, despite its ingenuity, it does not succeed.

+ If necessary, immaterial beings exist, such as numbers or sets, maybe one of those – or something like them – explains the universe, not God.

1. Abstract objects are causally inert on standard philosophical views. If abstract objects exist (like numbers, sets, propositions), they have a crucial limitation: - They don't cause anything - They don't do anything - They don't stand in causal relations Think about the number 7: - It doesn't create anything - It doesn't bring things into existence - It just "is," existing abstractly (if it exists at all) This is part of what it means to be abstract: to be outside the causal order entirely. 2. We need a cause that can bring the universe into existence. The question is: what explains the existence of the contingent physical universe? This requires: - Something with causal power - Something that can bring about effects - Something that can actualize possibilities and make contingent things exist Abstract objects, even if necessary and immaterial, simply don't have these capabilities. They're the wrong kind of thing to serve as causes. 3. An analogy: plans vs. builders. Think of it this way: - Suppose mathematical truths exist abstractly as necessary beings - These might be like the plans or blueprints for possible worlds - But plans don't build houses; builders do - Similarly, abstract structures don't create universes; agents with causal power do Even if there exists an abstract mathematical structure describing our universe, that doesn't explain why that structure is instantiated in concrete reality. You still need something with causal power to actualize the structure. 4. Personal agents can be both necessary and causally active. Here's what makes the God hypothesis superior: - God can be metaphysically necessary (existing by His own nature) - Yet also personal and causally active (able to bring things into existence) - This combines the explanatory strengths we need: necessity plus causal efficacy A necessarily existing mind can: - Choose to create - Actualize possibilities - Bring contingent realities into being This is exactly what we need to explain the universe. 5. The distinction between abstract and concrete. Philosophers typically distinguish: - Abstract objects: outside space and time, causally inert, necessary if they exist - Concrete objects: located in space and/or time, causally active, contingent But the God of classical theism doesn't fit neatly into either category: - Like abstract objects, God is immaterial, outside physical space-time, and necessary - Like concrete objects, God is causally active and capable of bringing things into existence - God is best understood as a necessarily existing concrete being: a personal agent who exists beyond physical space-time but can act causally 6. Theism provides a unified explanation. The theistic answer elegantly combines all the features we need: - Necessity (to explain existence without infinite regress) - Immateriality (to transcend physical reality) - Causal power (to bring the universe into being) - Intentionality (to explain why this particular universe exists) Abstract objects give us necessity and immateriality but lack causal power and intentionality. Only a necessarily existing personal being provides the complete package.

+ A sufficient reason need not necessitate the universe's existence; it could allow indeterminism, where multiple outcomes are possible, so no single necessary being like God is required.

1. The argument already accommodates indeterminism through personal agency. The objection assumes the contingency argument requires strict deterministic necessitation. But it doesn't. The argument proposes a necessary being (God) who freely chooses to create. This involves: - A necessary foundation (God exists in all possible worlds) - But contingent outcomes (God freely chooses which world to actualize) Think of a parent deciding to have a child: - The parent necessarily exists (as a person with causal powers) - But the decision to procreate is free and could have been otherwise - The child's existence is explained by the parent's intentional choice - Yet this explanation doesn't deterministically necessitate every detail of the child's life Similarly, God's necessary existence plus His free choice provides a sufficient reason for the universe without making the universe's existence or every detail of it strictly necessary. 2. Indeterminism without a foundation still faces the explanatory gap. Suppose we grant that reality can be indeterministic, with multiple possible outcomes. This still doesn't eliminate the need for a necessary foundation. Here's why: Even if multiple universes are possible, we need to explain: - Why is there this indeterministic system at all rather than nothing? - Why are these possibilities available rather than other possibilities or no possibilities? - What grounds the probability distributions or the framework within which indeterminism operates? Think of a dice game: - The dice can land on various numbers indeterministically - But this presupposes the existence of dice, a table, gravity, and rules of the game - The indeterministic outcomes still need a foundation Similarly, even if the universe's details are indeterministic, we still need to explain why there is a universe-generating system at all. That explanation points to a necessary foundation. 3. Stopping at an indeterministic natural process leaves key questions unanswered. If someone says, "The universe came from an indeterministic quantum process, and that's the sufficient reason," we can still ask: - Why does the quantum vacuum exist? - Why do quantum fields have the properties they have? - Why are the laws of quantum mechanics what they are? - Why is there this indeterministic framework rather than nothing? These questions remain even if we grant indeterminism. The explanatory work hasn't been completed. We've just pushed the question back to: why does an indeterministic quantum system exist? 4. Personal agency provides a richer explanation than impersonal indeterminism. Compare two explanatory models: - Impersonal indeterminism: The universe arose from a brute, indeterministic process. Multiple outcomes were possible, and this one occurred probabilistically. - Personal agency: A necessary personal being freely chose to create this universe for a purpose. The personal agency model explains more: - Why there is something rather than nothing (God's nature necessitates His existence) - Why this particular universe exists (God chose it) - Why the universe exhibits order, fine-tuning, and life-permitting conditions (God designed it) The impersonal model leaves all of these as brute facts or lucky accidents.

+ If a necessary being like God provides the sufficient reason for the universe, then the universe must be necessary too, via modal logic (if necessary P entails Q, then Q is necessary), creating a paradox with the universe's contingency.

1. The modal principle applies only to logical entailment, not free choice. The objection assumes: - If God necessarily exists - And God's existence entails the universe's existence - Then the universe must necessarily exist But this only follows if the entailment is strict logical entailment. The theistic model doesn't work this way. Here's the crucial distinction: - God necessarily exists (He exists in all possible worlds) - But God's decision to create is free and contingent (He could have refrained from creating) - Therefore: "God exists" is necessarily true, but "God creates" is contingently true Think of an analogy: - A wealthy person necessarily has resources (given their wealth) - But they don't necessarily give to charity - Their giving is a free choice, even though they necessarily have the ability to give Similarly, God necessarily has creative power, but His exercise of that power is free. 2. Free agency breaks the necessitation chain. Modal logic tells us: - If □P (P is necessary) - And P → Q (P entails Q with logical necessity) - Then □Q (Q is necessary) But God's creation involves: - □P (God necessarily exists) - P ⋄→ Q (God freely chooses Q, where ⋄ indicates a contingent connection) - Therefore: ⋄Q (Q is contingent) The free choice introduces contingency into the relationship. God's necessary existence doesn't necessitate the universe's existence because creation is a free act, not a logical entailment. Think of human decisions: - You necessarily exist (right now) - But you don't necessarily raise your hand right now - Whether you raise your hand is a free choice - So from your necessary existence doesn't follow the necessity of every action you take 3. This preserves both God's necessity and the universe's contingency. God's necessary nature includes the power to create, but creating is not part of His essence. He might have refrained from creating anything at all. We can see this pattern even in more modest examples: suppose numbers exist necessarily. It is still entirely contingent whether any mathematician thinks about the number 7, and entirely contingent whether the number 7 describes any physical collection of objects. The number's necessary existence doesn't necessitate these contingent facts about it. The same logic applies to God: His necessary existence does not necessitate His contingent creative acts. 4. The alternative leads to even bigger problems. If we deny that a necessary being can freely produce contingent effects, we face dire consequences: - Either everything is necessary (Spinozistic necessitarianism, where everything that exists must exist) - Or nothing is explained (we're left with a brute contingent universe) Neither option is attractive: - Necessitarianism conflicts with our strong intuition that the universe is contingent - A brute universe leaves the biggest question unanswered The theistic model, which allows a necessary being to freely create contingent reality, avoids both horns of this dilemma. 5. This philosophical conclusion converges with the longstanding position of classical theism, and that convergence is worth noting. This point is not offered as a theological argument for the conclusion. The argument stands entirely on its philosophical merits. But it is genuinely striking that philosophers and theologians from Augustine to Aquinas to Leibniz himself, working independently through rigorous philosophical reasoning, arrived at precisely this same destination: that creation must be a free act of a necessary being, not a logical emanation from God's nature. Classical theism has always held that God was under no compulsion to create; creation is a free, personal, intentional act He might have withheld entirely. What is worth noticing is that philosophical argument and theological tradition, pursued by independent routes, land in exactly the same place. The God that careful reasoning leads us to, a necessary being whose creative act is free rather than compelled, is recognizably the same God classical theism has always described. When two independent lines of inquiry converge on the same conclusion, that agreement is itself a mark in its favor.

+ Hierarchical (vertical) causal chains, like a tower of blocks, end within the natural world (e.g., the Earth as the 'unheld up holduper'), without needing a supernatural terminator like God; further questions shift to horizontal (historical) explanations.

A preliminary note: This objection is more naturally at home as a challenge to Thomistic or Aristotelian cosmological arguments, which trace hierarchical chains of simultaneously operating efficient causes that sustain things in existence right now. The Leibnizian contingency argument asks a different and deeper question: not what is currently holding the universe up, but what explains the existence of the entire contingent system at all. These are importantly different questions. We engage the objection here because it surfaces regularly in discussions of cosmological arguments, and clarifying the difference helps illuminate exactly what the contingency argument is and is not claiming. 1. The objection confuses physical support with metaphysical explanation. When we stack blocks vertically, each block physically rests on the one below. Eventually we reach the ground. But this is about physical support, not metaphysical existence. The contingency argument asks a different question: - Not: "What physically supports the universe?" - But: "What metaphysically explains the existence of the universe?" Think of the difference: - Physical support: the table holds up the book - Metaphysical explanation: why does the table exist? Why does the book exist? Why does anything exist at all? The Earth might be the bottom of the physical support chain, but it's not the bottom of the metaphysical explanation chain. We can still ask: why does the Earth exist rather than nothing? 2. Stopping at the Earth (or the universe) leaves the fundamental question unanswered. The objection says: "The causal chain ends at the Earth (or at the universe's initial state). No further explanation is needed." But this is unsatisfying: - The Earth is contingent. It came into existence about 4.5 billion years ago. - It depends on countless factors: the laws of physics, the properties of matter, the evolution of the solar system. - We can easily conceive of the Earth not existing. So saying "the chain ends at the Earth" doesn't answer the question: why does the Earth exist rather than not? Similarly, saying "the chain ends at the universe's initial state" doesn't answer: why does that initial state exist rather than nothing? 3. The vertical vs. horizontal distinction doesn't eliminate the need for God. The objection suggests: - Vertical (hierarchical) chains of dependence end within nature - Horizontal (temporal) chains explain the sequence of events over time - Therefore, no need for God But this misses the point: Both vertical and horizontal explanations operate within the natural world and presuppose its existence. Neither answers the deeper question: why is there a natural world at all? Think of it this way: - You can explain the history of a chess game move by move (horizontal) - You can explain how each piece is physically supported by the board (vertical) - But neither explanation tells you why the chess set exists or who is playing the game Similarly, even complete scientific explanations (horizontal and vertical) within the universe don't explain why there is a universe to begin with. 4. The whole universe is contingent, even if its parts form a complete causal structure. Suppose we grant that: - Every event in the universe has a natural cause (horizontal explanation) - Every object in the universe has natural support (vertical explanation) - The entire network of causes is self-contained This still doesn't explain why this entire contingent system exists rather than nothing. An analogy: Imagine a novel with a complete, internally consistent plot. Every event is explained by earlier events. Every character's existence is explained by their parents within the story. Still, we can ask: why does this novel exist? Who wrote it? Why is there a story at all? The fact that the story is internally complete doesn't eliminate the need for an author external to the story.

+ Even if a necessary foundation exists, it could be the initial state or properties of the universe itself, not a personal deity like God; theists and naturalists describe the same 'weird' timeless features differently.

1. The universe's initial state is clearly contingent, not necessary. For something to be metaphysically necessary means it exists in all possible worlds, cannot fail to exist, and cannot be different in any fundamental way. The universe's initial state meets none of these criteria. It came into existence at the Big Bang. It carries specific contingent properties: precise values of energy, entropy, and spatial curvature, which physicists routinely model in alternative configurations. A universe with higher initial entropy, different energy density, or a different spacetime topology is perfectly conceivable and scientifically modelable. If the actual initial state were necessary, these alternatives would be logically impossible rather than merely different. Since they are not impossible, the initial state is contingent. 2. Calling the initial state "necessary" is an ad hoc move without independent justification. Here's the typical dialectic: - The contingency argument concludes: a necessary being must exist to explain the contingent universe - The critic responds: "The universe's initial state is necessary" - When asked for justification: "Well, it has to be necessary, otherwise your argument works" This is not genuine reasoning. No independent argument is given for why the initial state should be regarded as necessary. Conclusions should be established by evidence and philosophical argument, not assumed in order to block an inference. 3. Impersonal states cannot explain intentional creation. Even if we granted (which we shouldn't) that the universe's initial state exists necessarily, this wouldn't explain: - Why that state produces a universe finely tuned for life - Why that state gives rise to observers rather than remaining barren - Why that state actualizes its potential to create rather than remaining in some other configuration An impersonal initial state has no preferences, no intentions, no reasons to create one thing rather than another. Think of it this way: - A blueprint exists (let's say necessarily) - But blueprints don't build buildings - You need an architect with intentions to actualize the blueprint Similarly, even a necessary initial state needs something with causal power and intentionality to explain why it produces a specific kind of universe. 4. Personal explanation is categorically different from impersonal explanation, and the difference matters. Personal beings can make choices, have intentions and purposes, and freely decide to create or refrain from creating. Impersonal states cannot; they simply are what they are. The objection sometimes suggests that theists and naturalists are simply describing the same reality using different language: theists call it "God" while naturalists call it "the universe's necessary foundation." But this is false equivalence. The God of classical theism is personal, intentional, and causally active. An impersonal initial state is none of these things. These are genuinely different explanatory hypotheses, not merely different labels. Think of the difference between explaining a painting by reference to the artist's intentions and explaining it as the result of paint randomly splattering. These are not the same explanation in different words. When explaining the existence of a finely tuned, life-permitting universe, personal explanation has clear advantages: it accounts for why something exists rather than nothing (God chose to create), why this particular universe exists (God selected it for His purposes), and why the universe exhibits order and fine-tuning (God designed it). Impersonal necessity provides none of these explanatory resources.

+ The Principle of Sufficient Reason leads to necessitarianism, the view that everything must exist exactly as it does. If God has a sufficient reason for creating this universe, that reason must necessitate this universe, making nothing truly contingent. This is a fatal problem for the argument.

1. This is one of the most powerful philosophical objections to the PSR and deserves a careful response. Philosopher Peter van Inwagen (Metaphysics, Westview Press, 2002) presses the following challenge: if the PSR is true, every contingent fact must have an explanation. But where does that explanation bottom out? If it bottoms out in something necessary, like God's nature, then what follows from that necessary thing must also be necessary. The universe, supposedly following from God's decision, would then be necessary too. But that contradicts our premise that the universe is contingent. So the PSR seems to devour the contingency the argument depends on. This is a genuine philosophical tension, and it is why the precise formulation of the PSR matters enormously. 2. The modest PSR used in this argument is specifically designed to avoid necessitarianism. The version used here does not say "every contingent fact has a necessitating explanation." It says "every existing thing has an explanation either in its own nature or in an external cause." Philosopher Alexander Pruss (The Principle of Sufficient Reason, Cambridge University Press, 2006) calls this a "weak PSR." The key insight is that a sufficient reason need not be a necessitating reason. Think of the difference between two kinds of causes: - A mechanistic cause: a lit match in the presence of oxygen must produce fire. No choice is involved; the outcome is determined. - A personal cause: a chef deciding to add salt to a dish. She has genuine reasons (it improves the flavor, it follows the recipe, she simply prefers it), but she could have chosen otherwise. The chef's reasons are a genuine sufficient explanation for why she added salt. Yet they didn't make adding salt the only possible outcome. God's free choice to create works the same way: it is a fully sufficient explanation for the universe's existence without making the universe logically inevitable. 3. Necessitation and explanation are not the same thing. Van Inwagen's argument quietly assumes that "sufficient reason" means "logically necessitating cause." But personal agents routinely provide sufficient reasons for their actions without those reasons making the action the only possible outcome. Think of a judge sentencing someone convicted of theft. The judge has genuine reasons for the sentence: the severity of the offense, the person's prior record, the principles of proportional justice. Those reasons fully explain the decision; there is nothing arbitrary or mysterious about it. A full account can be given. But the same judge, weighing the same reasons, could have sentenced differently. The explanation is both genuine and sufficient without being compelled. God can have sufficient reasons for creating this universe rather than another, or rather than nothing at all, without those reasons making His choice inevitable. 4. Pruss's solution preserves both PSR and genuine contingency. The weak PSR excludes truly inexplicable brute facts, meaning things that exist for literally no reason, without collapsing into the view that everything must be exactly as it is. The universe has a genuine explanation: God freely chose to create it. That explanation is a personal act of will, not a mechanical derivation. Because creation is free, the universe is explained but not compelled. Contingency is preserved precisely because the explanation is personal. 5. Necessitarianism would be a problem for the objection itself. Here is a subtle but important irony. If van Inwagen is right that the PSR inevitably leads to necessitarianism, the view that everything that exists must exist exactly as it is, the objector faces an uncomfortable question of their own. Was their rejection of theism necessary? Were genuine alternatives ever available to them, or was the conclusion fixed in advance? Most critics of the PSR are also firmly opposed to necessitarianism; they want a world in which things genuinely could have been otherwise and in which deliberation and choice are real. But that intuition, that genuine alternatives exist and that things could have been different, is precisely what the modest PSR combined with a personally free God is designed to preserve. The objector cannot wield necessitarianism as a weapon against theism while simultaneously recoiling from it themselves.

+ Richard Dawkins argues that God, as a being complex enough to design and create a universe, must be at least as complex as that universe and therefore at least as improbable. Postulating God doesn't solve the problem of existence; it just replaces one mystery with an even bigger one.

1. This objection is widely popular but rests on a category mistake. In The God Delusion (Houghton Mifflin, 2006), Richard Dawkins argues that any being capable of designing and creating a universe must be enormously complex, and complex things require explanation. So postulating God shifts the explanatory burden rather than resolving it. This is vivid and rhetorically forceful, and it deserves a serious response rather than dismissal. 2. God, as classically conceived, is not complex in the relevant sense. Dawkins's argument assumes that God is something like a very powerful cosmic engineer: a being with an enormously detailed mind stuffed full of specifications, blueprints, and technical calculations. But this is not what classical theism means by God. The God of classical theism is metaphysically simple. He is not composed of parts: not physical parts, not informational parts, not psychological components that could be assembled or disassembled. His knowledge, power, and goodness are not separate modules He happens to possess. They are aspects of a single, unified, non-composite being. Think of the difference between two kinds of knowledge: - A human engineer who has accumulated technical knowledge over decades, fact by fact and principle by principle, stored in a brain that is itself a vastly complex physical organ. - A being for whom knowing, willing, and acting are one simple, unified act: not a warehouse of accumulated facts but a single, undivided awareness from which all things are known at once. Dawkins's objection has real force against the first kind of mind. It has no purchase on the second. God's intelligence, as classical theists understand it, is not a database that grows more complex the more it contains. It is a simple, unified, non-composite act of knowing. 3. The statistical improbability argument doesn't apply to necessary beings. Dawkins's case is essentially probabilistic: complex things are statistically unlikely, so God is improbable. But probability applies to contingent things, meaning things that could have been otherwise and that exist against a background of other possibilities that might have obtained instead. A necessary being, one that exists in all possible worlds and cannot fail to exist, is simply not subject to probability calculations. Asking "how probable is God's existence?" is like asking "how probable is it that 2+2=4?" The framework doesn't fit. Necessary truths are not probable or improbable; they simply are. If God is a necessary being, Dawkins's probabilistic reasoning does not get off the ground. 4. Theism is actually more parsimonious, not less. Dawkins implies that explaining the universe by God requires an entity even more complex than the universe, making the explanation costlier than what it explains. But consider the full explanatory ledger: - Naturalism must leave the following as brute unexplained facts: the existence of the universe, the fine-tuning of physical constants, the origin of life, the emergence of consciousness, and the reality of objective moral values. - Theism accounts for all of these with a single explanatory entity: a necessary, personal, intelligent Creator. One simple, non-composite being versus a mountain of brute facts. When you tally the full explanatory cost, theism is the more parsimonious hypothesis, not the less. 5. The "who designed the designer?" question is an invitation, not a refutation. Dawkins's move is: "You explain the universe by God, but now you need to explain God." This sounds like a devastating regress, but notice it is not actually a refutation of the argument. It is an invitation to say more about what kind of being God must be. The contingency argument gives a principled answer: God is the kind of being who requires no external explanation because He is metaphysically necessary. His non-existence is impossible. This is not a retreat into mystery; it is a precise philosophical claim about a specific category of being with a long tradition of careful development. Think of a detective who solves a crime. When she names the perpetrator, someone might ask: "But who hired them?" That is a fair follow-up, but it is not a reason to abandon the solution already reached. She follows each question until she arrives at an answer that doesn't generate a further question of the same kind. The contingency argument argues we reach exactly that stopping point with God: a necessary being whose non-existence is impossible and who therefore needs no further cause. 6. Dawkins's objection, pressed consistently, undermines naturalism equally. If the force of the objection is that any explanation requires a further explanation, naturalism faces the identical problem. What explains the quantum vacuum? What explains the laws of physics? What explains why there are any physical laws at all, rather than none? Naturalism typically declares these brute inexplicable facts, which is precisely the move the contingency argument says is inadequate. Dawkins's objection, if it succeeds against theism, succeeds equally against naturalism. The crucial difference is that theism offers a principled stopping point (a necessary being), while naturalism stops at a contingent fact and calls the discussion over.

+ Baruch Spinoza argued that there is only one substance, which he called God or Nature (Deus sive Natura), and which exists necessarily and of which everything else is simply a mode or expression. If Spinoza is right, the universe just is the necessary being, and there is no personal, transcendent God distinct from it.

1. Spinoza represents the most philosophically serious version of the "necessary universe" proposal. Unlike the bare assertion that the universe happens to be necessary (see Defeater 3), Spinoza's necessitarianism in the Ethics (1677) is a fully developed philosophical system. Spinoza argues that substance, meaning that which exists in itself and is conceived through itself, can only be one. That single infinite substance exists necessarily and has infinitely many attributes, two of which human beings can grasp: thought (mind) and extension (matter). What we call "God" and what we call "Nature" are simply two ways of describing the same necessary reality. Everything that exists is a mode, or finite expression, of this one infinite substance. This is a serious, historically significant philosophical position and it deserves more than dismissal. 2. Spinozistic necessitarianism eliminates genuine contingency, and with it much of science and everyday reasoning. If Spinoza is right, nothing could possibly be otherwise. Every event, every particle, every configuration of matter follows necessarily from the one substance, which means physicists modeling alternative universes, physicians considering alternative treatments, and people deliberating about choices are all engaged in a kind of collective confusion. None of those alternatives were ever genuinely possible. That is a very high philosophical price to pay. 3. Spinoza's God is not a satisfying explanation for why this particular reality exists. Spinoza's one substance is impersonal, unable to act freely, unable to choose or create in any meaningful sense, and identical with the natural world rather than transcendent over it. This is a dramatic departure from what classical theism means by God. But more importantly, even granting Spinoza's framework, a pressing explanatory question remains: why does this particular substance, with these specific attributes, exist necessarily rather than some other substance, or no substance at all? Why are thought and extension the fundamental attributes rather than something entirely different? Spinoza's answer, that there can only be one infinite substance and this is it, is a declaration rather than an explanation. It tells us the universe is necessary without telling us why this particular reality is the necessary one. 4. The personal cause inference distinguishes God from Spinoza's Nature. One of the argument's crucial steps is the inference to a personal cause (see P3, Point 5). An impersonal, necessary substance of the Spinozistic variety fails this test decisively. If the cause of the universe is eternal and changeless, its effects should also be eternal and changeless. But the universe is not eternal and changeless; it began approximately 13.8 billion years ago and has a history of development and change. An impersonal necessary substance cannot explain why a temporal, developing universe arose from it rather than an equally eternal, unchanging effect. Only a personal, free agent who chooses to create at a particular "moment," even if time itself begins with that act, can explain a temporal beginning arising from an eternal, changeless cause. 5. Spinozism cannot account for fine-tuning. If every feature of the universe follows necessarily from the one substance, then every physical constant and law is exactly as it must be. But physicists can coherently model universes with different constants, and these alternatives are not logically contradictory. If the actual constants are necessary consequences of Spinoza's substance, these alternatives should be logically impossible, not merely different. Since they are perfectly coherent and not logically impossible, this strongly suggests the actual constants are contingent rather than necessary. Fine-tuning is deeply at odds with necessitarianism. 6. Spinozism commands a very small minority of contemporary philosophers for good reasons. Despite the elegance and internal consistency of Spinoza's system, necessitarianism is rejected by the overwhelming majority of contemporary philosophers of religion, metaphysicians, and philosophers of science. The conflict with genuine contingency, the inability to explain why this particular substance is the necessary one, and the troubling implications for free will, moral responsibility, and personal identity all count heavily against it. Jonathan Bennett's careful reconstruction of Spinoza's system (A Study of Spinoza's Ethics, Hackett, 1984) is the most rigorous and sympathetic modern treatment available. Even Bennett acknowledges the profound difficulties necessitarianism generates. Spinozism remains a minority position precisely because the costs of accepting it are so steep.

+ Some philosophers argue that absolute nothingness is a genuine possibility: if you successively imagine removing every contingent object from the world, you eventually reach an empty world with nothing in it. If nothingness is truly possible, then existence needs no explanation, things can simply arise from nothing without cause, and the PSR fails.

1. The subtraction argument, stated carefully. Philosopher Thomas Baldwin ("There Might Be Nothing," Analysis, 1996) proposes the following line of reasoning. Start with a possible world containing only a finite number of concrete objects. Each object is contingent, meaning it might not have existed. So we can coherently imagine removing it without contradiction. Repeat this for every object, and we eventually arrive at a possible world containing no concrete objects at all, an empty world with nothing in it. If an empty world is genuinely possible, nothingness is a coherent baseline state. On this view, the universe's existence doesn't cry out for explanation any more than the absence of a universe would. The PSR's demand for a reason why something exists seems to lose its grip. 2. The argument has a hidden assumption that begs the question against this argument. The subtraction procedure only works if every object in the world is contingent, that is, capable of not existing. This is precisely what the contingency argument denies. If a necessary being exists, one that is present in every possible world, it cannot be subtracted. You cannot coherently remove a necessary being even in thought, because by definition it exists in every possible world, including any world you try to empty out. The subtraction argument therefore quietly assumes from the start that there is no necessary being. But that is exactly what the contingency argument is trying to establish. Using the subtraction argument to defeat the contingency argument is circular: it assumes the conclusion it needs to prove. 3. Does a genuinely empty world even make coherent sense? Even granting the subtraction procedure, it is far from obvious that a world with zero concrete objects is genuinely possible rather than merely conceivable in a loose sense. Consider: in a world with no objects, are there still truths? Is it still true that 2+2=4? Are there still logical relations, mathematical facts, and possible states of affairs? If so, the "empty" world is not truly empty; it still contains abstract objects and necessary truths. And if those exist necessarily, then absolute nothingness, not even logical or mathematical structure, may not be a coherent possibility at all. The universe's existence may not be a competition between something and literal nothing. It may be a question about which form of something exists, and that question still needs answering. 4. The subtraction argument, even if successful, does nothing to explain this universe. Suppose we grant the conclusion: an empty world is possible. This establishes that nothingness is a coherent alternative. But it gives us zero help in explaining why, given that nothingness was possible, we find ourselves in a highly specific, finely tuned, law-governed, life-permitting universe. Think of walking into a room and finding it elaborately furnished: expensive art on the walls, a burning fireplace, a dinner table perfectly set with silverware and candles. The fact that empty rooms are possible gives you no help whatsoever in explaining what you're looking at. The specific, ordered, complex reality in front of you still demands an account. The possibility of nothingness makes the existence of this particular something even more striking, not less. Why this, rather than nothing?