Who Created Evil?

And it seemed to me better to believe Thee to have created no evil (to whom Thy mercies confess out of my mouth), than to believe the nature of evil, such as I conceived it, could come from Thee. (5.10.20)

But again I said, Who made me? Did not my God, Who is not only good, but goodness itself? Whence then came I to will evil and nill good, so that I am thus justly punished? Who set this in me, and ingrated into me this plant of bitterness, seeing I was wholly formed by my most sweet God? If the devil were the author, whence is that same devil? And if he also by his own perverse will, of a good angel became a devil, whence, again, came in him that evil will whereby he became a devil, seeing the whole nature of angels was made by that most good Creator? (7.3.5)

Augustine questions the nature of evil

Where is evil then, and whence, and how crept it in hither? What is its root, and what its seed? Or hath it no being? Why then fear we and avoid what is not? Or if we fear it idly, then is that very fear evil, whereby the soul is thus idly goaded and racked. Yea, and so much a greater evil, as we have nothing to fear, and yet do fear. Therefore either is that evil which we fear, or else evil is, that we fear. Whence is it then? seeing God, the Good, hath created all these things good. He indeed, the greater and chiefest Good, hath created these lesser goods; still both Creator and created, all are good. Whence is evil? Or, was there some evil matter of which He made, and formed, and ordered it, yet left something in it which He did not convert into good? Why so then? Had He no might to turn and change the whole, so that no evil should remain in it, seeing He is Almighty? (7.5.8)

Augustine equates goodness with being

And what more monstrous than to affirm things to become better by losing all their good? Therefore, if they shall be deprived of all good, they shall no longer be. So long therefore as they are, they are good: therefore whatsoever is, is good. That evil then which I sought, whence it is, is not any substance: for were it a substance, it should be good. For either it should be an incorruptible substance, and so a chief good: or a corruptible substance; which unless it were good, could not be corrupted. I perceived therefore, and it was manifested to me that Thou madest all things good, nor is there any substance at all, which Thou madest not; and for that Thou madest not all things equal, therefore are all things; because each is good, and altogether very good, because our God made all things very good. (7.12.18)