2 Corinthians 7:9-11

9Now I rejoice, not because you were made sad, but because you were made sad to the point of repentance. For you were made sad as God intended, so that you were not harmed in any way by us.

10For sadness as intended by God produces a repentance that leads to salvation, leaving no regret, but worldly sadness brings about death.

11For see what this very thing, this sadness as God intended, has produced in you: what eagerness, what defense of yourselves, what indignation, what alarm, what longing, what deep concern, what punishment! In everything you have proved yourselves to be innocent in this matter.