The Kalam cosmological argument is a modern formulation of the cosmological argument for the existence of God. It is named after the Kalam (medieval Islamic scholasticism) from which many of its key ideas originated. [1] Philosopher and theologian William Lane Craig was principally responsible for revitalizing these ideas for modern academic discourse through his book The Kalām Cosmological Argument (1979), as well as other publications.
The argument's central thesis is the metaphysical impossibility of a temporally past-infinite universe and of actual infinities existing in the real world, traced by Craig to 11th-century Persian Muslim scholastic philosopher Al-Ghazali. This feature distinguishes it from other cosmological arguments, such as that of Thomas Aquinas, which rests on the impossibility of a causally ordered infinite regress, and those of Leibniz and Samuel Clarke, which refer to the principle of sufficient reason. [2]
Since Craig's original publication, the Kalam cosmological argument has elicited public debate between Craig and Graham Oppy, Adolf Grünbaum, J. L. Mackie and Quentin Smith, and has been used in Christian apologetics. [3] [4] According to Michael Martin, the cosmological arguments presented by Craig, Bruce Reichenbach, and Richard Swinburne are "among the most sophisticated and well-argued in contemporary theological philosophy". [5]
The most prominent form of the Kalam cosmological argument, as defended by William Lane Craig, is expressed in two parts, as an initial syllogism followed by further philosophical analysis. [6]
The Kalam cosmological argument is a deductive argument. Therefore, if both premises are true, the truth of the conclusion follows necessarily.
Craig argues that the cause of the universe necessarily embodies specific properties, in being: [7]
Based upon this, he appends a further premise and conclusion: [7]
Craig notes the theological implications that follow from the final conclusion of this argument. [9]
The Kalam cosmological argument was influenced by the concept of the prime mover, introduced by Aristotle. It originates in the works of theologian and philosopher John Philoponus (490–570 AD) [10] and was developed substantially under the medieval Islamic scholastic tradition during the Islamic Golden Age. Important historical proponents include Al-Kindi, [11] Al-Ghazali [12] and St. Bonaventure. [13] [14] [15]
One of the earliest formulations of the argument is described by Islamic philosopher and theologian Al-Ghazali: [16]
The argument developed as a concept within Islamic theology between the 9th and 12th centuries, refined in the 11th century by Al-Ghazali ( The Incoherence of the Philosophers ) and in the 12th by Ibn Rushd (Averroes). [17] It reached medieval Christian philosophy in the 13th century and was discussed by Bonaventure as well as Thomas Aquinas in his Summa Theologica (I, q.2, a.3) and Summa Contra Gentiles (I, 13).
Islamic perspectives may be divided into positive Aristotelian responses strongly supporting the argument, such as those by Al-Kindi and Averroes, and negative responses critical of it, including those by Al-Ghazali and Muhammad Iqbal. [18] Al-Ghazali was unconvinced by the first-cause arguments of Al-Kindi, arguing that only the infinite per se (that is an essentially ordered infinite series) is impossible, arguing for the possibility of the infinite per accidens (that is an accidentally ordered infinite series). He writes: [19]
Muhammad Iqbal also stated: [18]
According to atheist philosopher Quentin Smith, "a count of the articles in the philosophy journals shows that more articles have been published about Craig's defense of the Kalam argument than have been published about any other philosopher's contemporary formulation of an argument for God's existence." [20]
The Kalam cosmological argument has received criticism from philosophers such as J. L. Mackie, Graham Oppy, Adolf Grunbaum, Michael Martin, Quentin Smith, Wes Morriston and Alex Malpass as well as physicists Sean M. Carroll, Lawrence Krauss and Victor Stenger. [21]
Modern discourse encompasses the fields of both philosophy and science (e.g. the fields of quantum physics and cosmology), which Bruce Reichenbach summarises as: [22]
Since the temporal ordering of events is central, the Kalam argument also brings issues of the nature of time into the discussion. [23]
Craig and James Sinclair have stated that the first premise is obviously true, at the least more plausibly true than its negation. [24] Craig offers three reasons to support the premise: [25]
According to Reichenbach, "the Causal Principle has been the subject of extended criticism", which can be divided into philosophical and scientific criticisms. [26]
Graham Oppy, J. L. Mackie and Wes Morriston have objected to the intuitiveness of the first premise. [27] [28] [29] Oppy states:
Mackie affirms that there is no good reason to assume a priori that an uncaused beginning of all things is impossible. Moreover, that the Causal Principle cannot be extrapolated to the universe from inductive experience. He appeals to David Hume's thesis ( An Enquiry Concerning Human Understanding ) that effects without causes can be conceived in the mind, and that what is conceivable in the mind is possible in the real world. [30] This argument has been criticised by Bruce Reichenbach and G.E.M. Anscombe, who point out the phenomenological and logical problems in inferring factual possibility from conceivability. [31] [32] Craig notes: [33] [34]
Morriston asserts that causal laws are physical processes for which we have intuitive knowledge in the context of events within time and space, but that such intuitions do not hold true for the beginning of time itself. He states: [35]
Craig responds that causal laws are unrestricted metaphysical truths that are "not contingent upon the properties, causal powers, and dispositions of the natural kinds of substances which happen to exist", remarking: [36]
For scientific evidence against the first premise, Paul Davies appeals to the phenomenon of quantum indeterminacy, wherein subatomic processes appear to contradict a deterministic model of cause and effect. [37] Craig argues that, though quantum indeterminism uproots the proposition that "every event has a cause", it is nonetheless consistent with the causal premise that "everything that begins to exist has a cause", denoting the more modest view that objects cannot come into existence entirely devoid of causal conditions. [38]
He also notes that the phenomenon of indeterminism is specific to the Copenhagen interpretation of quantum mechanics, pointing out that this is only one of a number of different interpretations, some of which he states are fully deterministic (mentioning David Bohm) and none of which are as yet known to be true. He concludes that subatomic physics is not a proven exception to the first premise. [39]
Philosopher Quentin Smith refers to the example of virtual particles, which appear and disappear through fluctuations in the quantum vacuum, apparently at random, to assert the tenability of uncaused natural phenomena. [40] In his book A Universe from Nothing: Why There is Something Rather Than Nothing , cosmologist Lawrence Krauss has proposed how quantum mechanics can explain how spacetime and matter can emerge from 'nothing' (referring to the quantum vacuum). Philosopher Michael Martin has also appealed to quantum vacuum fluctuation models to support the idea of a universe with uncaused beginnings. He writes: [41]
Philosopher David Albert has criticised use of the term 'nothing' in describing the quantum vacuum. In a review of Krauss's book, he states: [42]
Craig argues that the quantum vacuum state, in containing measurable energy, cannot be characterised as nothing , therefore, that phenomena originating from the quantum vacuum cannot be described as uncaused. On the topic of virtual particles, he writes: [43]
Cosmologist Alexander Vilenkin has stated that even "the absence of space, time and matter" cannot truly be defined as 'nothing' given that the laws of physics are still present, though it would be "as close to nothing as you can get". [44]
Craig defends premise two using both scientific and philosophical arguments for the finitude of the past, covering the topics of cosmology, physics and a philosophical examination of actual infinities.
For physical evidence, Craig appeals to:
Professor Alexander Vilenkin, one of the authors of the Borde–Guth–Vilenkin theorem, writes: [47]
According to Vilenkin and co-author Alan Guth, the past boundary described by the Borde–Guth–Vilenkin theorem does not necessarily represent a cosmic beginning, instead the beginning of cosmic inflation. [48] Though it "opens the door" for theories other than an absolute beginning, in a 2012 lecture, Vilenkin would discuss problems with alternative theories that would claim to avoid a cosmological beginning (including eternal inflation, cyclic and emergent models) concluding: "All the evidence we have says that the universe had a beginning". [49] In publications, he would propose that the Borde–Guth–Vilenkin theorem is sufficient evidence for a beginning of the universe. [50] [51] [52]
Craig has stated that, if anything existed before the past boundary described by the theorem, it would be a non-classical region described by an as-yet-undetermined theory of quantum gravity. He refers to statements by Vilenkin [53] that, in such a scenario the non-classical region, rather than the boundary, would then be the beginning of the universe. He concludes, "either way, the universe began to exist." [54]
Victor J. Stenger has referred to the Aguirre–Gratton model [55] for eternal inflation as an exemplar by which to avoid a cosmic beginning. [56] In correspondence with Stenger, Vilenkin remarked how the Aguirre–Gratton model attempts to evade a beginning by reversing the "arrow of time" at t = 0, but that: "This makes the moment t = 0 rather special. I would say no less special than a true beginning of the universe." [57]
For philosophical evidence of the finitude of the past, Craig refers to:
Accordingly, he argues:
Philosopher Andrew Loke similarly characterizes the metaphysical problems of a beginningless universe, referring to a variation of Hilbert's Hotel, [62] and Ben Waters has published the story of Methuselah's Diary as a refinement of the tale of Tristram Shandy. [63]
Craig maintains that, though it is metaphysically impossible for actual infinities to exist in the real world, they (and the absurdities that attend their existence in the real world) are describable via mathematics, therefore logically possible. [64] He also distinguishes between actual infinities and potential infinities, stating that it is fully possible for potential infinites to exist in the real world, in contrast to the former: [65]
Thomist philosopher Edward Feser has remarked that the Kalam argument is based upon a presentist theory of time in which past and future events do not exist, declaring that this would be incompatible with objections against an eternal past based upon Hilbert's Hotel: [66]
Craig affirms that the simultaneous existence of the enumerated objects is irrelevant, so long as past events have been real, thus instantiated in reality, they can be counted. [67] [68] He refers to a narrative by Aquinas of a blacksmith who, from an eternal past, has used and broken successive hammers. He notes that the discarded hammers need no longer exist to be counted as an actual infinite. [69] Furthermore, that the absurdities attending the existence of actual infinites in reality still apply if the enumerated objects no longer exist: [70]
Feser contends that past events are more analogous to abstract objects, such as natural numbers, than concrete objects, such as hotel rooms and guests. For this, he refers to Aristotle's postulate that denies the existence of time independent of objects that change: [71]
Craig proposes that an endless future qualifies as a potential rather than actual infinite, given that future events, unlike past events, are yet to be actualised and merely potential. [68] Morriston and Malpass argue that this asymmetry is arbitrary. They stipulate that an endless future should be deemed actually infinite, given that future events will be actual, just as past events are deemed actual in that they have been. They conclude that, if Hilbert's Hotel disproves an eternal past, so too does it negate an endless future, contradicting Christian theology. [72]
Noting in agreement that future events cannot be actually infinite, Craig responds that this objection begs the question and fails to address the ontological distinction between past and future qualified by the objectivity of temporal becoming under presentism. [73] [74] He writes:
In a critique of Craig's book The Kalām Cosmological Argument , published in 1979, Michael Martin writes: [75]
Martin adds that Craig has not justified his claim of creation ex nihilo , remarking that the universe may have been created from pre-existing material in a timeless or eternal state. Moreover, that Craig takes his argument too far beyond what his premises allow in stating that the creator is greater than the universe. For this, he cites the example of a parent "creating" a child who eventually becomes greater than he or she. [76]
In the Blackwell Companion to Natural Theology, published in 2009, Craig and James Sinclair present a philosophical analysis of the properties of the cause of the universe, denoting that they follow by entailment from the initial syllogism of the Kalam cosmological argument: [7]
Based upon analysis of the information above, Craig concludes: [7]
He notes the theological implications of this union of properties: [79]
The Kalam cosmological argument is based on the A-theory of time, also known as the "tensed theory of time" or presentism, in which past and future events do not exist in reality (they have existed, or will exist, but do not exist now) and only the present exists. [80] This is opposed to the B-theory of time, also known as the "tenseless theory of time" or eternalism, in which past, present and future events co-exist, the passage of time is an illusion of consciousness and there is no privilege to the present other than as a frame of reference. [81] Craig explains: [38]
Craig has defended the A-theory against objections from J. M. E. McTaggart and hybrid A–B theorists. [82] [83] He refers to the neo‐Lorentzian interpretation of the Special Theory of Relativity, which he contends has become tenable in light of recent findings in quantum mechanics concerning Bell's theorem. [84] Similar to Einstein's original interpretation, the Lorentzian view describes a 3-dimensional universe existing through time, with objects in motion demonstrating time dilation and length contraction. However, these relativistic distortions occur relative to a privileged rest frame (an absolute frame of reference for the universe) rather than relative to each observer. [85]
He writes that the Lorentzian interpretation, in postulating an absolute space and absolute time, resolves the fragmentation of reality that characterises Einsteinian relativity, in which observers in relative motion occupy different spaces and times. Importantly, Lorentz's view of time as dynamic, and distinct from space, renders it compatible with the A-theory conception of a tensed universe. [86]
Philosopher Yuri Balashov asserts that both consensus and evidence support Minkowski's interpretation of relativity, which posits a 4D geometric universe inhabited by objects extended in time as well as space. [87] In spurning the notion of a 3D universe existing in time, Minkowskian relativity rejects the A-theory, correlating instead with the B-theory conception of a tenseless spacetime. Balashov remarks: [88]
Craig suggests that Balashov underestimates the challenge to Minkowskian relativity posed by recent findings. [85] He criticises Balashov for adopting a verificationist methodology that ignores important metaphysical and theological arguments underpinning the A-theory, affirming that correct interpretation of Special Relativity is not merely a physical, but also a metaphysical question. [86] [89]
In a 2020 interview, Craig proposed that the Kalam cosmological argument could be adapted to the B-theory of time by: [90]
Under the B-theory, scientific evidence for the finitude of the past would still be valid and the argument as a whole, though damaged and requiring reformulation, would still be tenable. Philosopher Ben Waters has also argued that a defense of the Kalam cosmological argument does not require a commitment to the A-theory. [91]
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