Even if I caused you sorrow by my letter, I do not regret it. Although I did regret it—for I see that my letter caused you sorrow, but only for a short time—
8. For though I grieved you. He now begins to apologize to the Corinthians for having handle them somewhat roughly in the former Epistle. Now we must observe, in what a variety of ways he deals with them, so that it might appear as though he sustained different characters. The reason is that his discourse was directed to the whole of the Church.
There seems to be a connection between Co2 2:13 (where the apostle said he had no rest in his spirit when he found not Titus at Troas) and the fifth verse of this chapter: and so great was his affection to the Corinthians, and his concern about their behaviour in relation to the incestuous person, that, in his further travels, he still had no rest till he heard from them.
Commenting on 2 Corinthians 7:5-11
For though I made you sorry with a letter,.... His former epistle, relating to the incestuous person: I do not repent, though I did repent; not of writing the letter, which was wrote by divine inspiration; but of the sorrow occasioned by it, though now he did not repent of that: for I perceive that the same epistle made you sorry, though it were but...