II. THE SOUL IS NEITHER THE HARMONY NOR ENTELECHY OF THE BODY—THE SOUL IS THE HARMONY OF THE BODY; AGAINST THE PYTHAGOREANS.
(12). a. Since the soul is not corporeal, its real nature must be ascertained. Shall we assert that she is something distinct from the body, but dependent thereon, as, for instance, a harmony? Pythagoras, indeed, used this word in a technical sense; and after him the harmony of the body has been thought to be something similar to the harmony of a lyre. As tension produces in the lyre-strings an affection (or, manner of being, or state) that is called harmony, likewise, as contrary elements are mingled in our body, an individual mixture produces life and soul, which, therefore, is only an individual affection of this mixture.