Abstract

In lieu of an abstract, here is a brief excerpt of the content:The Summa Contra Gentiles and Aquinas's Way to GodGaven KerrThere is to be found in Aquinas's writings a way to God which is his own and most personal. This way to God is the way from existence (esse) and arrives at God as pure existence itself, the fount of all being, without which nothing would be. It is deployed in several contexts ranging from the De ente et essentia to the Summa theologiae [ST]. Yet, in the Summa contra gentiles [SCG], it is peculiarly absent. The proofs of God's existence which Aquinas offers in the latter are almost exclusively drawn from Aristotle, and they do not exhibit any of the refined metaphysical thinking about esse that characterizes Thomas's thinking about God in other works.1 For a work that is intended to be both apologetical in nature and explicitly philosophical from the outset, this is strange. Thomas is always at home in his own metaphysics of esse, and he deploys it with ease and finesse especially when demonstrating God's existence and discussing the divine nature. But in the SCG his proofs of God's existence and the subsequent reasoning about the divine nature are awkward and, one could even say, clumsy. Why did he not just dispense with the Aristotelian thinking on motion and movers and all the clarifications that involves? Why not simply stick with his own favored account of act and potency interpreted in terms of the metaphysics of esse?In the current paper I wish to address these issues. I shall begin with an account of what I take to be Aquinas's way to God and why I think it is [End Page 1273] his way to God. Having done that, I will then address the issue as to why this way to God does not appear in the SCG reasoning, but slowly emerges only after God's existence has been demonstrated. I shall conclude that the apologetical and consciously philosophical nature of the SCG offer us an insight into why Thomas did not lean on his metaphysics of esse in his (initial) discussions of God there.Aquinas's Way to GodAquinas famously argues that there is a distinction between essence and esse in things. The context of this distinction is that of universal hylemorphism, which holds that in all composite things there are two principles: a principle of potency and a principle of actuality. In traditional Aristotelian fashion, defenders of universal hylemorphism held that the principle of actuality in a thing is its form, whereas the principle of potency is its matter.2 All things other than God are composed of matter and form, since all things other than God have some element of potency. But to locate the potentiality of anything other than God in the matter of the thing creates a problem when it comes to separated substances (angels) and the immaterial rational soul. Such substances (or components of substances in the case of the rational soul) are taken to be separated from matter and all material conditions. Nonetheless they are created and thereby dependent on God, so they must have some potentiality.So how do we attribute matter—that is, potency—to separate substances?According to defenders of universal hylemorphism, the answer is to distinguish between corporeal matter and incorporeal matter. The former is the kind of physical matter that we typically take to be the matter of things, whereas the latter is a kind of non-physical matter which the separate substances possess. Thus, it is not proper to say that such substances are [End Page 1274] immaterial, but rather that whilst material they are incorporeal. Universal hylemorphism has the advantage that it neatly distinguishes all things from God by isolating a principle of potency (matter) which all things other than God have. Nevertheless, universal hylemorphism presents problems of its own, not least the thorny one of making intelligible just what exactly a real (as opposed to conceptual) kind of matter is that is incorporeal.Aquinas for his part rejected universal hylemorphism from his earliest writings.3 He holds that it is precisely because separated substances are separated from all material conditions that...