18 Guard yourself then, O man; you have the signs of Antichrist; and remember them not only yourself, but impart them also freely to all. If you have a child according to the flesh, admonish him of this now; if you have begotten one through catechizing, put him also on his guard, lest he receive the false one as the True. For the mystery of iniquity does already work. I fear these wars of the nations; I fear the schisms of the Churches; I fear the mutual hatred of the brethren. But enough on this subject; only God forbid that it should be fulfilled in our days; nevertheless, let us be on our guard. And thus much concerning Antichrist.
Source: Catechetical Lectures (New Advent)