Evil, then, the origin of which I had been seeking, has no substance at all; for if it were a substance, it would be good. For either it would be an incorruptible substance and so a supreme good, or a corruptible substance, which could not be corrupted unless it were good. I understood, therefore, and it was made clear to me that you made all things good, nor is there any substance at all not made by you.

—Augustine, Confessions