Plato’s Critique of Naturalism

Abstract

This chapter discusses Plato's critique of Naturalism. A metaphysics of the natural world as conceived of by Naturalists is quite different from a metaphysics of the natural world conceived of by Platonists. For Naturalists, topics like identity, existence, cause, and time, all have to be approached as principles exclusively for knowledge of entities in a three or four-dimensional framework. By contrast, Plato assumes and Aristotle argues that identity is equivocally applied not just to artifacts and to things that exist in nature, but also to that which is immaterial. Plato's designation of the subject matter of philosophy as, roughly, “the intelligible world,” obviously excludes an extension of the term “philosophy” to that which is non-intelligible. But the sensible world, as Plato says in Republic, participates in the intelligible world in some way. Accordingly, insofar as it does, it belongs to the subject matter of philosophy. The difference between the natural scientist and the philosopher on this account is, as Plato says, that the former “hypothesizes” its foundations, while the latter grounds these in the “unhypothetical first principle.” The chapter then studies Socrates' “autobiography” in Phaedo, as well as the subject matter of philosophy in Republic, Theaetetus, and Sophist.