2 Corinthians 7:8-9; 2 Corinthians 7:12-13

8 For if I gave you pain by that letter, I do not regret it, though I did regret it then. I see that that letter, even though for a time it gave you pain, had a salutary effect.

9 Now I rejoice, not in your grief, but because the grief led to repentance; for you sorrowed with a godly sorrow, which prevented you from receiving injury from us in any respect.

12 Therefore, though I wrote to you, it was not to punish the offender, nor to secure justice for him who had suffered the wrong, but it was chiefly in order that your earnest feeling on our behalf might become manifest to yourselves in the sight of God.

13 For this reason we feel comforted; and--in addition to this our comfort--we have been filled with all the deeper joy at Titus's joy, because his spirit has been set at rest by you all.