21 I am afraid that when I come again my God will humble me before you, and I will be grieved over many who have sinned earlier and have not repented of the impurity, sexual sin and debauchery in which they have indulged.

Read 2 Corinthians 12:21 Using Other Translations

And lest, when I come again, my God will humble me among you, and that I shall bewail many which have sinned already, and have not repented of the uncleanness and fornication and lasciviousness which they have committed.
I fear that when I come again my God may humble me before you, and I may have to mourn over many of those who sinned earlier and have not repented of the impurity, sexual immorality, and sensuality that they have practiced.
Yes, I am afraid that when I come again, God will humble me in your presence. And I will be grieved because many of you have not given up your old sins. You have not repented of your impurity, sexual immorality, and eagerness for lustful pleasure.