That is, the above said is sufficient, and I am afraid that, having come to you, I will be compelled to deal with you severely. By humiliation, then, he means the necessity of strongly punishing someone, although many consider this an honor for themselves. And he did not say "lest I be humiliated," but "lest my God humiliate me," showing that he would do this for the sake of God. And if the matter did not concern God and His commandments, he himself would not have appeared so severe. By the words "my God" he shows his fervent love for God.
2 Cor. 12:21. And that I should not have to mourn over many who have sinned before and have not repented of the uncleanness, fornication, and lewdness which they practiced.
Notice the tenderness of the apostle: he bewails the transgressions of others. He did not say "all," but "many," and not simply "who have sinned," but also "have not repented," because those who persist in their wound are worthy of compassion. He also does not expose them, giving them a convenient path to repentance; for he mentioned repentance so that they might turn to it, and so that when he comes, he would not have to punish them and therefore be humbled, that is, grieve exceedingly. Notice also that he mentioned repentance on account of the Novatians. By sin, understand every kind of uncleanness, because every sin defiles. Or in particular, the abominations of carnal intercourse, for in Corinth there was not just one adulterer, but many, and moreover in many forms of licentiousness.