Passion is the evil in adultery. If a man has no opportunity of living with another man's wife, but if it is obvious for some reason that he would like to do so, and would do so if he could, he is no less guilty than if he was caught in the act.
Saint AugustineThat one woman is both mother and virgin, not in spirit only but even in body. In spirit she is mother, not of our head, who is our Savior himself-of whom all, even she herself, are rightly called children of the bridegroom-but plainly she is the mother of us who are his members, because by love she has cooperated so that the faithful, who are the members of that head, might be born in the Church. In body, indeed, she is the Mother of that very head.
Saint AugustineDivine Scripture is wont to frame, as it were, allurements for children from the things which are found in the creature; whereby, according to their measure, and as it were by steps, the affections of the weak may be moved to seek those things that are above, and to leave those things that are below. But the same Scripture rarely employs those things which are spoken properly of God, and are not found in any creature; as, for instance, that which was said to Moses, I am that I am; and, I Am has sent me to you."
Saint Augustine