The Kalam Cosmological Argument

Craig's Kalām

Abstract

William Lane Craig recovered the temporal cosmological argument of the medieval mutakallimūn — preeminently Abū Ḥāmid al-Ghazālī — and recast it in the analytic idiom. The distinctive claim is not merely that the cosmos needs a cause, but that the universe has a finite past, and that anything with a finite past requires a transcendent cause of its beginning.

Formal statement

1. Everything that begins to exist has a cause of its existence.
2. The universe began to exist. 2a. An actual infinite cannot exist. 2b. A beginningless temporal series of events is an actual infinite. 2c. Therefore, a beginningless temporal series of events cannot exist (SEP §7.2).
3. Therefore, the universe has a cause of its existence.
4. If the cause of the universe's existence is sufficient to produce a universe with space-time, it must transcend space-time.
5. Therefore, a personal cause of the universe exists (SEP §KalaCosmArgu, premises 17–19).

Key evidence / textual basis

The argument's historical pedigree is laid out carefully by Reichenbach: the mutakallimūn "developed the temporal version of the argument from the impossibility of an infinite regress, now referred to as the kalām cosmological argument" (SEP §1). Al-Ghazālī (1058–1111), on Reichenbach's telling, reasoned that whatever begins to exist needs a cause of its beginning; that the world is a chain of temporal events each preceded by earlier ones; and that, because an actual infinite is impossible, this chain cannot stretch back forever — so the world began, and its cause is called Allah or God.

The two philosophical sub-arguments against an actually-infinite past are rehearsed in SEP's reconstruction: (i) an actual infinite cannot exist and a beginningless series would be one (SEP §7.2); (ii) an actual infinite cannot be formed by successive addition, and the temporal series is formed by successive addition (SEP §7.3). These are meant to be philosophical grounds for finitude; the Big Bang cosmology is then offered as empirical confirmation, not as the load-bearing premise (SEP §7.4).

Scripturally the argument coheres with — though it does not strictly presuppose — the claim of Gen 1:1 that "In the beginning, God created the heavens and the earth," and Heb 11:3, that "the universe was created by the word of God, so that what is seen was not made out of things that are visible."

Leading proponents

• William Lane Craig — restored the argument to contemporary analytic philosophy; defends both the Hilbert's-Hotel argument against an actual infinite and the successive-addition argument.
• Abū Ḥāmid al-Ghazālī — medieval Ashʿarī progenitor. His occasionalist cosmology is described by Griffel as "a cosmology where in each [moment] God's decision determines what happens," with the chain of temporal events terminating in a "First Cause, which is itself uncaused" (SEP §6).

Strongest counter-arguments

The most serious contemporary objection lodged against premise 1 is the quantum-mechanical challenge: "Some argue that the principle of causation, as used in the argument, is highly suspect. One reason concerns quantum phenomena" (SEP §7.1), where certain sub-atomic events appear (on some interpretations) to lack determinate prior causes. Against premise 2, Adolf Grünbaum's objection is that "to begin to exist requires a … first instant of existence," and on certain models of space-time the universe has no such first instant even if it has a finite past (SEP §7.2).

Hume's seventeenth-century anticipation remains structurally important: Philo in the Dialogues argues that the demand for a cause of "the whole" is illicit — "the uniting of these parts into a whole … is performed merely by an arbitrary act of the mind, and has no influence on the nature of things" (Hume, Dialogues Part 9). Having given the cause of each of twenty particles of matter, Philo adds, he would find it unreasonable to be asked separately for the cause of the whole twenty. If Hume is right, the inference from causes of parts to a cause of the whole series commits a fallacy of composition.

Responses

Craig's reply to the quantum objection is that indeterminism is not acausality: even on a genuine-indeterminism reading, sub-atomic events have antecedent necessary conditions; they are not instances of something beginning from absolutely nothing. On the Grünbaum objection, Craig redefines "begins to exist" tenselessly so that the definition does not require a first instant (SEP §7.2).

Against the Humean composition-fallacy charge, Craig's defenders note that the kalām does not infer a cause of the whole from causes of the parts; it infers a cause from the premise that the whole itself began to exist, which is not a merely-mereological claim. Whether this reply succeeds is live.

Assessment

Assessment: Strong — the argument is the most widely-defended theistic cosmological argument in contemporary analytic philosophy of religion, and its two sub-arguments against actual infinities remain, per the SEP, "one of the most debated theistic arguments in the recent analytic literature" (SEP §KalaCosmArgu). It is not, however, beyond reasonable dissent, and the inference from "first cause" to "personal cause" bears more weight than the opening premises.

Thomistic Cosmological

Abstract

Thomas Aquinas offers a structurally different argument. For Aquinas the cosmological question is not did the universe begin? but what keeps it in being now? The Second Way of the Summa Theologiae I, q.2, a.3 argues from the ordered series of efficient causes per se — causes acting in the present — not from any temporal first moment. Aquinas held that one cannot demonstrate the temporal beginning of the world by reason alone; that was known only by revelation. The causal argument therefore does not need the kalām premise that the universe has a finite past.

Formal statement

Aquinas' Second Way, in his own words: "In the world of sense we find there is an order of efficient causes… in efficient causes it is not possible to go on to infinity, because in all efficient causes following in order, the first is the cause of the intermediate cause, and the intermediate is the cause of the ultimate cause… Therefore it is necessary to admit a first efficient cause, to which everyone gives the name of God" (Aquinas, Summa I q.2 a.3).

Formally: 1. There exist things whose existence is caused by another. 2. No such thing can be the efficient cause of itself. 3. An ordered series of per se efficient causes cannot extend to infinity, for if it did there would be no first cause, and so no intermediate and no ultimate effect. 4. Therefore there exists a first, uncaused efficient cause — "which everyone gives the name of God."

Key evidence / textual basis

The distinctive Thomistic move is in premise 3: the regress ruled out is of simultaneously-operating causes (the hand moves the stick moves the stone), not of temporally-successive causes. As Aquinas glosses in the First Way, "subsequent movers move only inasmuch as they are put in motion by the first mover; as the staff moves only because it is put in motion by the hand" (Aquinas, Summa I q.2 a.3).

The Third Way supplements this with an argument from possibility and necessity: "every necessary thing either has its necessity caused by another, or not. Now it is impossible to go on to infinity in necessary things which have their necessity caused by another, as has been already proved in regard to efficient causes. Therefore we cannot but postulate the existence of some being having of itself its own necessity, and not receiving it from another" (Aquinas, Summa I q.2 a.3). The historical lineage of this contingency-argument is traced by SEP to Ibn Sina (c. 980–1037), "taken up by Thomas Aquinas (1225–74) in his Summa Theologica (I, q.2, a.3) and in his Summa Contra Gentiles (I, 13)" (SEP §1).

Ps 90:2 — "Before the mountains were brought forth, or ever you had formed the earth and the world, from everlasting to everlasting you are God" — names precisely the kind of necessary being the Third Way argues toward.

Leading proponents

• Thomas Aquinas — architect of the Five Ways; his argument is indifferent to whether the universe has a temporal beginning, which is why it survives objections targeted at kalām's premise 2.
• Edward Feser — contemporary Thomist who has reworked the Second and Third Ways in modern analytic vocabulary (corpus gap: his primary texts await ingestion).

Strongest counter-arguments

Two Humean objections land directly. First, against the causal principle in its unrestricted form: "in tracing an eternal succession of objects, it seems absurd to inquire for a general cause or first author. How can any thing, that exists from eternity, have a cause, since that relation implies a priority in time, and a beginning of existence?" (Hume, Dialogues Part 9). Thomists reply that the Second Way's causal series is per se and concurrent — not temporally prior — so Hume's objection misfires against the Thomistic form even if it lands on popular kalām.

Second, against the move from "necessary being" to God: Hume asks, "why may not the material universe be the necessarily existent Being, according to this pretended explication of necessity? We dare not affirm that we know all the qualities of matter; and for aught we can determine, it may contain some qualities, which, were they known, would make its non-existence appear as great a contradiction as that twice two is five" (Hume, Dialogues Part 9). This is a serious challenge: the Third Way infers a necessary being, but not — without further metaphysical commitments — a necessary being distinct from the universe.

Responses

The Thomist's reply to Hume's necessary-matter suggestion is that matter is composite (form and matter; act and potency) and therefore metaphysically contingent in a way that precludes its being the necessary being the argument reaches. Whether that reply succeeds depends on the viability of the broader Aristotelian-Thomistic metaphysics, and that is where the contemporary debate is actually joined.

Assessment

Assessment: Strong — the Thomistic per se argument is immune to the specifically temporal objections raised against kalām and has enjoyed a genuine revival in contemporary analytic Thomism. Its weight depends on the plausibility of the act/potency and essence/existence distinctions it presupposes.

Hume's Dialogue Critique

Abstract

In Part 9 of the Dialogues Concerning Natural Religion, David Hume stages — and, through Cleanthes and Philo, dismantles — the a priori cosmological argument put in Demea's mouth. The objections gather into three clusters: (i) no a priori proof of a contingent matter of fact is possible; (ii) the phrase "necessary existence" has no coherent content we can verify; (iii) the demand for a cause of "the whole" commits a fallacy of composition once the causes of each part are given.

Formal statement

Reconstructing Hume's sceptical reply as a set of conditionals: 1. Whatever can be conceived as existent can be conceived as non-existent; no being's non-existence implies a contradiction; therefore no being's existence is demonstrable a priori (Hume, Dialogues Part 9). 2. The material universe, for anything we know, may be the necessary being; the argument from contingency does not uniquely pick out a transcendent God. 3. Given causes of each part of an eternal series, to demand a further cause of the whole is to reify an arbitrary mental grouping. 4. Therefore, the cosmological argument as standardly presented does not establish its conclusion.

Key evidence / textual basis

Hume's first move is the conceivability principle: "there is no being, therefore, whose non-existence implies a contradiction. Consequently there is no being, whose existence is demonstrable. I propose this argument as entirely decisive" (Hume, Dialogues Part 9). Whether or not one accepts the Humean psychology of conceivability, this forms the backbone of the modal critique later developed by critics of necessary-being arguments.

His second move is the necessary-matter conjecture: "It will still be possible for us, at any time, to conceive the non-existence of what we formerly conceived to exist… The words, therefore, necessary existence, have no meaning; or, which is the same thing, none that is consistent" (Hume, Dialogues Part 9).

His third move — the composition-fallacy charge — is the most frequently cited: "the whole, you say, wants a cause. I answer, that the uniting of these parts into a whole, like the uniting of several distinct countries into one kingdom, or several distinct members into one body, is performed merely by an arbitrary act of the mind" (Hume, Dialogues Part 9).

The SEP's article on Hume on religion glosses these passages as "Hume's most explicit assault on the cosmological argument" (SEP §3).

Leading proponents

• David Hume — Dialogues Concerning Natural Religion (1779), Part 9; An Enquiry Concerning Human Understanding (1748).
• Contemporary descendants of Hume's critique (Mackie, Sobel, Oppy) await ingestion into our corpus; readers should note that this article's atheistic view draws directly from Hume because the texts are in-corpus, not because Hume is the only live critic.

Strongest counter-arguments

Three classical replies are pressed. First, against the conceivability principle: from the fact that we can imagine X as non-existent it does not follow that X's non-existence is genuinely possible; the move from imaginability to metaphysical possibility is fallacious in many other domains and should not be trusted here. Second, against necessary-matter: matter is divisible, mutable, and composite — the very marks of contingency that both Aquinas and contemporary contingency-arguers take as ruling it out as the necessary being. Third, against the composition-fallacy charge: the kalām argument does not infer a cause of the whole from causes of the parts; it infers a cause of the whole from the whole's having begun to exist, which is a distinct claim.

Responses

Hume's defender replies (i) that the burden of proof sits on whoever claims metaphysical impossibility of non-existence, (ii) that the contingency-of-matter reply merely redescribes the disagreement in Aristotelian vocabulary, and (iii) that whether "the universe began to exist" is itself a composite claim depending on treating the sum of events as a genuine whole is exactly the point at issue.

Assessment

Assessment: Live — Hume's Part-9 objections are not knock-down, but each survives as a serious constraint on what cosmological arguments can be taken to have established. The contemporary philosophical consensus (per SEP) is not that the kalām has been refuted but that the debate remains genuinely open.