As a general rule, all that has been hitherto advanced respecting the nature of this deity, must be understood to refer to his properties: for the nature of the god is not one thing, and his influence another: and truly, besides these two, his energy a third thing: seeing that all things which he wills, these he is, he can, and he works. For neither doth he will that which he is not; nor is he without strength to do that which he wills; nor doth he will that which he cannot effect. Now this is very different in the case of men, for theirs is a double nature mixed up in one, that of soul and body; the former divine, the latter full of darkness and obscurity: hence naturally arise warfare and discord between the two.

Upon the Sovereign Sun (362)