Well, then, if the evil things are qualities of matter, and God changed its qualities for the better, we are bound to inquire into the origin of evil. For the qualities did not remain what they were by nature. If the qualities were not bad at first, and you say that through the change which God made, matter acquired its first bad qualities, God will be the cause of evil, because He changed qualities which were not bad, so that they became bad; or do you suppose God not to have changed the bad qualities into better ones, but that the only ones left, the indifferent ones, were changed by God for the sake of putting all in order?