Heretics are Self-Condemned. Heresy is Self-Will, Whilst Faith is Submission of Our Will to the Divine Authority.  The Heresy of Apelles.

Chapter VI.—Heretics are Self-Condemned. Heresy is Self-Will, Whilst Faith is Submission of Our Will to the Divine Authority.  The Heresy of Apelles.

On this point, however, we dwell no longer, since it is the same Paul who, in his Epistle to the Galatians, counts “heresies” among “the sins of the flesh,”¹⁸⁹⁷ who also intimates to Titus, that “a man who is a heretic” must be “rejected after the first admonition,” on the ground that “he that is such is perverted, and committeth sin, as a self-condemned man.”¹⁸⁹⁸ Indeed, in almost every epistle, when enjoining on us (the duty) of avoiding false doctrines, he sharply condemns¹⁸⁹⁹ heresies. Of these the practical effects¹⁹⁰⁰ are false doctrines, called in Greek heresies,¹⁹⁰¹ a word used in the sense of that choice which a man makes when he either teaches them (to others)¹⁹⁰² or takes up with them (for himself).¹⁹⁰³ For this reason it is that he calls the heretic self-condemned,¹⁹⁰⁴ because he has himself chosen that for which he is condemned. We, however, are not permitted to cherish any object¹⁹⁰⁵ after our own will, nor yet to make choice of that which another has introduced of his private fancy. In the Lord’s apostles we possess our authority; for even they did not of themselves choose to introduce anything, but faithfully delivered to the nations (of mankind) the doctrine¹⁹⁰⁶ which they had received from Christ. If, therefore, even “an angel from heaven should preach any other gospel” (than theirs), he would be called accursed¹⁹⁰⁷ by us. The Holy Ghost had even then foreseen that there would be in a certain virgin (called) Philumene¹⁹⁰⁸ an angel of deceit, “transformed into an angel of light,”¹⁹⁰⁹ by whose miracles and illusions¹⁹¹⁰ Apelles was led (when) he introduced his new heresy.