For even if I saddened you by my letter, I do not regret it; and if I did regret it (for I see that that letter saddened you, if only for a while), I rejoice now, not because you were saddened, but because you were saddened into repentance; for you were saddened in a godly way, so that you did not suffer loss in anything because of us. For godly sorrow produces a salutary repentance without regret, but worldly sorrow produces death. For behold what earnestness this godly sorrow has produced...
2 Corinthians 7:8–16