John Chrysostom
Do not object to me, he says, that only one man commits adultery. No, this is a sin common to all. Therefore he continues: “And you are puffed up.”
He did not say, “over such a sin,” for that would be senseless, but over the teaching of the sinner. Yet he did not state this plainly. He omitted the intermediate thought in order to touch them more deeply.
And consider Paul’s prudence. First he overthrew external wisdom and showed that it is nothing in itself, even if it is not joined to sin. Only then does he speak of the sin.
If he had proved the greatness of spiritual gifts in comparison with the incestuous man, who perhaps was distinguished by external wisdom, he would have accomplished nothing great.
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But by overthrowing it apart from sin, and showing that it is nothing in itself, he proved its utter uselessness. Therefore he first pronounced such a judgment upon it, and then began to speak of the sin.
Yet he does not deign to converse with the incestuous man. By this he shows the extreme disgrace of his deed. Instead, he tells the others that they should have wept, lamented, and been ashamed.
But you, he says, do the opposite. Therefore he adds: “And you are puffed up, instead of rather mourning.” Over what, they will say, should we mourn? Over this, that reproach has been brought upon the community of the Church.
And why should we mourn? “That such a man might be removed from among you.” He does not name him here, or rather, anywhere. So we usually act with things too shameful.
He did not say, “You have not rejected him.” Rather, as when speaking of a contagious disease, where one must weep and pray earnestly, he says: “that he might be removed.”
It is necessary both to pray and to use every measure so that he may be excommunicated from you. He does not condemn them for failing to inform him of this, but for failing to weep “that he might be removed.”
By this he shows that even without a teacher they should have done this themselves, because of the gravity of the crime.