Reviewed by: Five Proofs of the Existence of God: Aristotle, Plotinus, Augustine, Aquinas, Leibniz by Edward Feser Joshua Lim Five Proofs of the Existence of God: Aristotle, Plotinus, Augustine, Aquinas, Leibniz by Edward Feser (San Francisco: Ignatius Press, 2017), 330 pp. Notwithstanding Karl Barth's famous "Nein!" against the possibility of natural theology in his debates with Emil Brunner, investigations into the possibility of arguments for the existence of God based on natural reason have not been absent in contemporary philosophy and theology. In fact, the traditional conviction that God's existence is demonstrable by unaided human reason (demonstration here understood according to the Scholastic sense, "that the conclusion that God exists follows with necessity or deductive validity from premises that [End Page 1301] are certain, where the certainty of the premises can in turn be shown via metaphysical analysis" [306]) is not difficult to come by. This is in large part thanks to contemporary philosophers such as Edward Feser, whose works in Thomistic philosophy have made the Angelic Doctor's philosophical views more accessible to a popular and non-Thomist audience. His most recent book, Five Proofs of the Existence of God, is no exception. For a lucid and intelligible explication of the oft-misunderstood quinque viae to God's existence, one need look no further than Feser's introductory work, Aquinas: A Begnniner's Guide (or, for those who are more polemically disposed, one can hardly do better than Feser's The Last Superstition). Five Proofs offers something new insofar as it does not focus strictly on the thought of Aquinas. According to Feser, the book answers to "a need for an exposition and defense of certain important arguments for God's existence that Aquinas himself does not discuss and which have also received insufficient attention in recent work in natural theology" (10). To be sure, Thomas's argument based on motion (taken from Aristotle) and his argument based on the essence–existence distinction make an appearance; nevertheless, it is clear that one need not restrict oneself to the high Scholasticism of the thirteenth century in order to find good and demonstrative arguments for God's existence. Indeed, one need not restrict oneself even to Christian thinkers or to the Christian era. The book has seven chapters. Each of the first five works through a distinct argument for the existence of God. The proofs are presented in chronological order. Beginning with the Aristotelian proof, Feser proceeds to treat the neo-Platonic proof, the Augustinian proof, the Thomistic proof, and finally the rationalist (or Leibnizian) proof. Chapter 6, the lengthiest chapter of the book, is a treatment of the divine nature and God's relationship to the world. Here, Feser discusses in detail the divine attributes as well as the question of God's acting in and with secondary causal agents. The last chapter closes with responses to "common objections" to natural theology. Each chapter on a given proof is divided into two stages. In the first stage, Feser begins with a description (first mover, incomposite being, necessary being, etc.) and argues for the existence of a thing that corresponds to that description. In the second stage, he shows how that a thing must also have various attributes that are typically ascribed to God (simplicity, unity, goodness, intelligence, omnipotence, etc.). He then concludes to the existence of God. These two stages are presented first informally, as he says, "as if in a more discursive and leisurely way" (11), and then in a more formal manner, where the argument is spelled out step by step according to numbered propositions. [End Page 1302] While each of Feser's arguments for God's existence are discrete, nevertheless, they converge as they rise toward their conclusion. Thus, the proofs should not be viewed as compartmentalized and unrelated. Each argument, in its second stage, borrows from previous proofs. For example, once Feser has argued for God as actus purus in his Aristotelian proof, all the attributes that follow from God being actus purus are alluded to in the subsequent proofs as a sort of shorthand. This integral approach is related to Feser's division of each proof into two stages. The...
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