Although among heretics and schismatics there is the same Baptism, nevertheless, the remission of sins is not operative among them because of the very rottenness of discord and wickedness of dissension ... Baptism was in them, but it did not profit them outside the Church ... Outside the Church, Baptism works death because of discord.
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 AugustineNow the Apostle, under the inspiration of the Holy Spirit, says, "Knowledge inflates: but love edifies." The only correct inerpretation of this saying is that knowledge is valuable when charity informs it. Without charity, knowledge inflates; that is, it exalts man to an arrogance which is nothing but a kind of windy emptiness.
Saint Augustine