Abstract

In lieu of an abstract, here is a brief excerpt of the content:Reviewed by:The Metaphysics of Theism: Aquinas’s Natural Theology inSumma contra gentiles I by Norman KretzmannJohn F. WippelNorman Kretzmann. The Metaphysics of Theism: Aquinas’s Natural Theology in Summa contra gentiles I. Oxford: Clarendon Press, 1997. Pp. xii + 302. Cloth, $45.00.In this book Kretzmann intends to contribute to our understanding of Aquinas’s natural theology as it is presented in Bk I of his Summa contra gentiles(SCG). He hopes that it will be of value to medieval philosophical scholarship. Because he regards Aquinas’s natural theology as an ongoing active enterprise, he also wants to present a viable metaphysics of theism along the lines laid down by the medieval Doctor. Thomas himself indicates that in Bks. I–III of the four Books of this work he will set forth those aspects of Christian belief about God which can be established by unaided human reason. Kretzmann views Aquinas’s project in these three Books as the most promising and “most fully accomplished natural theology” of which he is aware.In ch. 1 Kretzmann discusses the relationship between philosophy and theology and suggests that a philosophical theology might be regarded as theology from the top down. Philosophy from the bottom up would seem to be the only kind of philosophy that can be distinguished from it. Kretzmann mentions the “philosophical theology” produced by many medieval theologians and by current philosophers of religion but, in a departure from Aquinas’s own terminology, regards this as a part of revealed theology. Kretzmann reserves the name “natural theology” for the theology that is a part of philosophy, and refers to it as theology from the bottom up. But, he suggests, if one were to take a metaphysically grounded natural theology as the first phase in a systematic presentation of the rest of philosophy, one could then refer to philosophy as proceeding from the top down, i.e., from an original demonstration of the existence of God and discussion of his nature to an examination of created reality and human nature and behavior as following from God as the first principle. It is this approach that he finds Thomas following in SCG I–III and which Kretzmann will subsequently refer to as his “natural theology.”In ch. 2 Kretzmann examines Thomas’s efforts in SCG I, c. 13 to demonstrate God’s existence. He thinks Aquinas is too demanding in requiring demonstrative argumentation for God’s existence at this point. For Rretzmann it will be enough initially to offer argumentation to show that the existence of God is an acceptable working hypothesis, and to move from this to an investigation of the divine nature. Thomas offers five a [End Page 528]posteriori arguments for God’s existence in c. 13, of which the first two, by far the lengthiest, are based on motion and deeply indebted to Aristotle. Kretzmann notes the close relationship between this first argument from motion and the later “first way” of Summa theologiae1, 2, 3. But because this argument has been ably analyzed and defended by Scott MacDonald, Kretzmann unfortunately bypasses it here and concentrates on the more complicated second argument. After submitting this to close analysis, he concludes that it has some fatal flaws which prevent it from being accepted as demonstrative.This result forces him in ch. 3 to move forward in his presentation of Thomas’s natural theology without having a conclusive argument for the existence of God or even of an extraordinary first being. But he is willing to use its conclusion, that there is an ultimate explanatory principle, as a working hypothesis, even though at this point he is not ready to identify this with even a hypothetically existing God. Instead, he will refer to it as “Alpha.” He follows Thomas’s employment of the way of negation in cc. 14–28 in removing a series of names that should not be predicated of God. As part of his effort in c. 15 to prove that God is eternal, Aquinas introduces a special argument based on the difference between possible (=corruptible) and necessary (=incorruptible) beings. Kretzman correctly takes this as in effect another argument for the existence of God...