The Cosmological Argument from Plato to Leibniz

This monograph presents a comprehensive historical analysis of the cosmological argument for God's existence, tracing its development from ancient Greek philosophy through medieval Islamic and Christian thought to early modern rationalism. Craig examines how successive thinkers refined and defended various forms of the argument, particularly the argument from contingency and the kalam cosmological argument.

Beginning with Plato's rudimentary formulation in the Laws and Phaedo, Craig demonstrates how the cosmological argument emerged from reflection on motion and causation in the physical world. He shows how Aristotle's more sophisticated version, based on the impossibility of an infinite regress of movers, established the logical framework that would dominate subsequent discussions. The analysis reveals how Islamic philosophers, particularly al-Kindi and al-Ghazali, developed the kalam variant, which argues from the beginning of the universe to a personal Creator.

Craig's intellectual-historical approach illuminates how medieval Christian thinkers transformed and defended these arguments. He examines Aquinas's "Five Ways," showing how the Angelic Doctor adapted Aristotelian reasoning while avoiding commitment to eternal creation. The work details Scotus's refinements regarding infinite regress and Ockham's nominalist challenges. Particularly significant is Craig's treatment of how Islamic occasionalism influenced later Christian thought about causation and divine action.

The study culminates with Leibniz's argument from sufficient reason, which Craig presents as the cosmological argument's most philosophically sophisticated expression. He analyzes how Leibniz addressed earlier objections while developing new modal concepts that strengthened the argument's logical structure. Throughout, Craig identifies recurring criticisms—from ancient atomists through medieval nominalists—and shows how defenders repeatedly modified the argument in response.

While maintaining scholarly objectivity in presenting each thinker's position, Craig's analysis implicitly favors versions of the cosmological argument that conclude to a personal Creator rather than an impersonal first principle. His treatment suggests that the kalam argument, refined by Islamic philosophers and later Christian thinkers, provides the most promising approach for natural theology. The work contributes to contemporary debates by demonstrating both the argument's historical resilience and its ongoing philosophical challenges, particularly regarding the principle of sufficient reason and the possibility of infinite causal series.