Socrates the Younger was wrong in always comparing an animal with the circle and bronze… [I]t supposes that a man can exist without his parts, as a circle can exist without the bronze. But in fact, the two cases are not similar, for an animal… cannot be defined without reference to parts in the right condition. (Metaphysics 1037a22–31; cf. On the Soul 403a3-b15 and Physics 194a1–27)
