2 Corinthians 2:7
“So that contrariwise ye should rather forgive him and comfort him, lest by any means such a one should be swallowed up with his overmuch sorrow.”
He bids them not only take off the censure; but, besides, restores him to his former estate; for if one let go him that has been scourged and heal him not, he has done nothing. And see how him too he keeps down lest he should be rendered worse by the forgiveness. For though he had both confessed and repented, he makes it manifest that he obtains remission not so much by his penitence as by this free gift. Wherefore he says, “to forgive him and to comfort him,” and what follows again makes the same thing plain. 'For' says he, 'it is not because he is worthy, not because he has shown sufficient penitence; but because he is weak, it is for this I request it.' Whence also he added, “lest by any means such a one should be swallowed up with overmuch sorrow.” And this is both as testifying to his deep repentance and as not allowing him to fall into despair.
But what means this, “swallowed up?” Either doing as Judas did, or even in living becoming worse. For, says he, if he should rush away from longer enduring the anguish of this lengthened censure, perchance also despairing he will either come to hang himself, or fall into greater crimes afterwards. One ought then to take steps beforehand, lest the sore become too hard to deal with; and lest what we have well done we lose by want of moderation.
Now this he said, (as I have already observed,) both to keep him low, and to teach him not to be over-listless after this restoration. For, not as one who has washed all quite away; but as fearing lest he should work anything of deeper mischief, I have received him, he says. Whence we learn that we must determine the penance, not only by the nature of the sins, but by the disposition and habit of them that sin. As the Apostle did in that instance. For he feared his weakness, and therefore said, “lest he be swallowed up,” as though by a wild beast, by a storm, by a billow.
Source: Homilies on Second Corinthians (New Advent)