Concerning the Nature of Good, Against the Manichæans 38Eternal Fire Torturing the Wicked, Not Evil.

For neither is eternal fire itself, which is to torture the impious, an evil nature, since it has its measure, its form and its order depraved by no iniquity; but it is an evil torture for the damned, to whose sins it is due. For neither is yonder light, because it tortures the blear-eyed, an evil nature.