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

8 For though I caused you sorrow with a letter, I do not now repent, though I did repent; for I perceive that the same epistle hath caused you sorrow, though it were but for a season.

9 Now I rejoice, not that ye were made sorrowful, but that your sorrow led to repentance. For ye were made sorrowful in a godly manner, that ye might receive injury from us in nothing.

12 Therefore, though I wrote unto you, I did not do so for the sake of him who had done the wrong, nor for his sake who suffered wrong, but that our concern for you in the sight of God might appear unto you.

13 Therefore we were comforted in your comfort. Yea, we rejoiced exceedingly more for the joy of Titus, because his spirit was refreshed by you all.