For you evil does not exist at all, and not only for you but for your created universe, because there is nothing outside it which could break in and destroy the order which you have imposed upon it. But in the parts of the universe, there are certain elements which are thought evil because of a conflict of interest.... All these elements which have some mutual conflict of interest are congruous with the inferior part of the universe which we call earth.... Because my soul did not dare to say that my God displeased me, it refused to attribute to you whatever was displeasing. Hence it came to adopt the opinion that there are two substances.

augustine, confessions, vii.19