18. And it was made clear to me that all things are good even if they are corrupted. They could not be corrupted if they were supremely good; but unless they were good they could not be corrupted. If they were supremely good, they would be incorruptible; if they were not good at all, there would be nothing in them to be corrupted. For corruption harms; but unless it could diminish goodness, it could not harm. Either, then, corruption does not harm--which cannot be--or, as is certain, all that is corrupted is thereby deprived of good. But if they are deprived of all good, they will cease to be. For if they are at all and cannot be at all corrupted, they will become better, because they will remain incorruptible. Now what can be more monstrous than to maintain that by losing all good they have become better? If, then, they are deprived of all good, they will cease to exist. So long as they are, therefore, they are good. Therefore, whatsoever is, is good. 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 thou madest all things good, nor is there any substance at all not made by thee. And because all that thou madest is not equal, each by itself is good, and the sum of all of them is very good, for our God made all things very good.