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

8 If I caused you pain by my letter, I do not regret it. Even if I did regret it before - for I do see that that letter did distress you, though only for a short time -

9 now I rejoice not because you were pained, but because the pain led you to turn back to God. For you handled the pain in God's way, so that you were not harmed by us at all.

12 So even though I wrote to you, it was not for the sake of either the one who did the wrong or the one wronged, but so that before God you could see for yourselves how deep is your devotion to us.

13 This is the reason we have been encouraged. Besides our own encouragement, we had the even greater joy of seeing how happy Titus was, because all of you set his mind at rest.