Everyone who observes himself doubting observes a truth, and about that which he observes he is certain; therefore he is certain about a truth. Everyone therefore who doubts whether truth exists has in himself a truth on which not to doubt.... Hence one who can doubt at all ought not to doubt the existence of truth.
Saint AugustineA young man had become possessed by a devil. The thing within him burst into loud lamentation and departed from the man. At once the youth's eye fell out on his cheek, and the whole of the pupil which had been black became white.
Saint AugustineWhoever, therefore, thinks that he understands the divine scriptures or any part of them so that it does not build on the double love of God and of our neighbor does not understand it at all. Thus a man supported by faith, hope, and charity, with an unshaken hold upon them does not need the scriptures. . . And many live by these three things in solitude without books.
Saint Augustine