This book considers the merits of Thomas Aquinas's arguments for the existence of God. Aquinas portrays philosophical reason as a form of wisdom that can attain to true knowledge of God. Should his views matter for contemporary Christian theology? What are the Aristotelian presuppositions required for these arguments to make sense, and are such presuppositions rationally defensible today? Particularly, should the modern Kantian and Heideggerian objections to any possible philosophical approach to God (as onto-theology) apply to the arguments of Aquinas? The author argues robustly in favor of the recovery of a sapiential conception of Thomistic philosophy.