John Gill Commentary 2 Corinthians 7:8

"For though I made you sorry with my epistle, I do not regret it: though I did regret [it] (for I see that that epistle made you sorry, though but for a season)," — 2 Corinthians 7:8 (ASV)

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 for a season ;
inasmuch as the sorrow was true, hearty, and genuine, though it was but for a time, the apostle was entirely satisfied, and the more pleased, because of its brevity, since it was sincere.