Abstract

Aristotle’s Metaphysics Λ.7 features an argumentative progression from the unwavering actuality of the unmoved mover through its necessity to its goodness, which goodness in turn grounds the manner in which it serves as the ultimate principle of motion, namely, by being an object of love and desire (1072b4-12). One link in this progression is especially brief and startling, namely the second of two inferences in this short sentence: “It is a being of necessity, therefore, and in so far as [it exists] necessarily, [it exists] finely, and it is in this way a principle” (1072b10-11). Aristotle slides smoothly from: x exists necessarily (ex anagkēs) to x exists finely (kalōs), without any intervening step. The seamless speed of this step is bound to give us pause—we naturally read it as enthymematic and start casting about for an intervening premise set. Still more arresting is its apparent move from a descriptive to a normative proposition. From our post-Humean vantage point we may be likely to presume that whatever the missing premise set of this inference turns out to be, somewhere buried in that set will need to be something of the form: if descriptive proposition (DP), then normative proposition (NP). Otherwise, Aristotle’s conclusion will have illicitly inferred a normative proposition from a descriptive premise set, in violation of the Humean edict that one cannot infer an ought from an is. Yet, if we smuggle the norm into our premise set along the way, we have merely relocated our problem. For then we will have asserted, or assumed, that the truth of some descriptive proposition is sufficient for the truth of some normative proposition, namely the consequent of the conditional: if DP, then NP. At any rate, this obtains unless necessity itself is already a normative notion, a questionable assumption, but one we will consider in due course. In either case, though, we need some explication of the route Aristotle follows when he moves, without comment, from necessity to goodness.