Titus 3:11

Warn a heretical man once or twice, and then reject him; knowing that such a person is perverted and sins, being self-condemned. — [OECUMENIUS] And elsewhere Paul says, "May God not grant them repentance." (2 Tim. 2:25) How then does he here order to cease? …

Avoid a heretical man after one and a second admonition, knowing that such a one is subverted, and sins, being condemned by himself. The name of heresy is stated in the Epistle to the Corinthians: For there must be also heresies: that they also, which are approved, may be made manifest among you (1 Cor. 11:19). And among the works of the flesh, it is listed in the Epistle to the Galatians: Now the works of the flesh are manifest, which are these; Adultery, fornication, uncleanness, lasciviousness, Idolatry, witchcraft, hatred, variance, emulations, wrath, strife, seditions, heresies, Envyings, murders, drunkenness, revellings, and such like: of the which I tell you before, as I have also told you in time past, that they which do such things shall not inherit the kingdom of God. (Gal. 5:19-21). It should be carefully observed in these things, that just as the other vices, which are counted among the works of the flesh, exclude us ((Al. are excluded)) from the kingdom of God: so too heresies take away the kingdom of God from us; and it does not matter how someone is excluded from the kingdom. But what is even more remarkable seems to be that thing in the Acts of the Apostles, our faith in Christ, and Ecclesiastical discipline, already being labeled as heresy by perverse men at that time. For the Jews say to the Apostle Paul, "Neither have we received letters from you from Judea ((Al. from you... from Judea)), nor has anyone coming from the brethren reported or spoken any evil of you. […]

For the faith of the sacred Scripture sets forth that the Church is not without, nor can be separated nor divided against itself, but maintains the unity of an inseparable and undivided house; since it is written of the sacrament of the passover, and of the lamb, which Lamb designated Christ: "In one house shall it be eaten: ye shall not carry forth the flesh abroad out of the house." Which also we see expressed concerning Rahab, who herself also bore a type of the Church, who received the command which said, "Thou shalt bring thy father, and thy mother, and thy brethren, and all thy father's household unto thee into thine house; and whosoever shall go out of the doors of thine house into the street, his blood shall be upon him." In which mystery is declared, that they who will live, and escape from the destruction of the world, must be gathered together into one house alone, that is, into the Church; but whosoever of those thus collected together shall go out abroad, that is, if any one, although he may have obtained grace in the Church, shall depart and go out of the Church, that his blood shall be upon him; that is, that he himself must charge it upon himself that he perishes; which the Apostle Paul explains, teaching and enjoining that a heretic must be avoided, as perverse, and a sinner, and as condemned of himself. For that man will be guilty of his own ruin, who, not being cast out by the bishop, but of his own accord deserting from the Church is by heretical presumption condemned of himself.

How then does he elsewhere say, "If God peradventure will give them repentance" (2 Tim. ii. 25); but here, "A man that is an heretic after the first and second admonition reject, knowing that he that is such is subverted and sinneth, being condemned of himself"? In the former passage he speaks of the correction of those of whom he had hope, and who had simply made opposition. But when he is known and manifest to all, why dost thou contend in vain? why dost thou beat the air? What means, "being condemned of himself"? Because he cannot say that no one has told him, no one admonished him; since therefore after admonition he continues the same, he is self-condemned. What then? dost thou command him to stop the mouths of gainsayers, if he must pass them by when they are doing everything to their own destruction? He means that he should not do it principally for their advantage, for being once perverted in their minds, they would not profit by it. But if they injured others, it behooved him to withstand and contend with them; and manfully await them, but if thou art reduced to necessity, seeing them destroying others, be not silent, but stop their mouths, from regard to those whom they would destroy. It is not indeed possible for a zealous man of upright life to abstain from contention, but so do as I have said. For the evil arises from idleness and a vain philosophy, that one should be occupied about words only. For it is a great injury to be uttering a superfluity of words, when one ought to be teaching, or praying, or giving thanks. For it is not right to be sparing of our money but not sparing of our words; we ought rather to spare words than our money, and not to give ourselves up to all sorts of persons. What means, "that they be careful to maintain good works"? […]

He forbade one coming from any heresy to be baptized in the Church; that is, he judged the baptism of all heretics to be just and lawful. And although special heresies have special baptisms and different sins, he, holding communion with the baptism of all, gathered up the sins of all, heaped together into his own bosom. And he charged that nothing should be innovated except what had been handed down; as if he were an innovator, who, holding the unity, claims for the one Church one baptism; and not manifestly he who, forgetful of unity, adopts the lies and the contagions of a profane washing. Let nothing be innovated, says he, nothing maintained, except what has been handed down. Whence is that tradition? Whether does it descend from the authority of the Lord and of the Gospel, or does it come from the commands and the epistles of the apostles? For that those things which are written must be done, God witnesses and admonishes, saying to Joshua the son of Nun: "The book of this law shall not depart out of thy mouth; but thou shalt meditate in it day and night, that thou mayest observe to do according to all that is written therein." Also the Lord, sending His apostles, commands that the nations should be baptized, and taught to observe all things which He commanded. If, therefore, it is either prescribed in the Gospel, or contained in the epistles or Acts of the Apostles, that those who come from any heresy should not be baptized, but only hands laid upon them to repentance, let this divine and holy tradition be observed. […]