John Chrysostom
Why, then, does the Apostle say elsewhere, "Perhaps God may grant them repentance" (2 Tim 2:25), but here, "Reject a heretic after the first and second admonition, knowing that such a one is perverted and sins, being self-condemned"?
There he speaks of men who give hope of correction and merely offer resistance. But when someone holds to heresy plainly and openly before all, why contend with him in vain? Why beat the air?
What does "being self-condemned" mean? He cannot say that no one spoke to him or admonished him. If, after admonition, he remains the same, then he is self-condemned.
Why, then, does the Apostle command him to stop the mouths of those who contradict (Tit 1:11), if one must withdraw from them when they do everything to their own destruction?
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He commands us not to labor especially for their own benefit, because they cannot receive any profit for themselves, having once for all been corrupted in mind.
But if they begin to destroy others, then one must rise against them, contend with them, and refute them with great courage.
When you are placed under necessity and see others being corrupted, do not be silent. Stop the mouths of the corrupters, caring for those who are ready to perish.
In general, a labor-loving man who leads a proper life cannot give himself over to disputes.
Therefore act as I have said, because disputes about mere words arise from idleness and excessive speculation.
Indeed, speaking superfluously is very harmful when one must either teach, or pray, or give thanks.
We should not guard money more than words. On the contrary, we should guard words more than money, and not entrust ourselves to everyone indiscriminately.
In disputes, the matter ends in nothing. Thus the Apostle here means an incorrigible heretic.
Not to care for those who give hope of correction belongs to negligence. But to tend the incurably sick belongs to lack of discernment and extreme folly, because by this we only make them more shameless.
And again: "Reject a heretic after the first and second admonition" (Tit 3:10).
Therefore it is not the holy thing itself that arms the enemies of everything sacred against us. Rather, when they come to know it, they are brought to madness by being filled with pride.
This is why it is no small benefit for them to remain in ignorance. In that case they will not show contempt.
But if they learn, the harm is double. They themselves gain no profit from it, except perhaps greater harm, and they cause you countless troubles.
Let those hear this who shamelessly associate indiscriminately with everyone and make a matter of contempt out of what is worthy of all reverence.
For this reason, when we celebrate the mysteries, we close the doors and forbid entry to the unillumined. We do this not because we consider the mysteries being celebrated ineffective, but because many are not yet sufficiently prepared for them.
For this reason Christ Himself spoke many things to the Jews in parables, because seeing they did not see (Mt 13:13).
"Reject a heretic after the first and second admonition"? He says this about an incorrigible man, of whom it is known that he is incurably sick.