2 Corinthians 7:9

7:9 Now 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.

2 Corinthians 2:2

2:2 For if I make you sad, who would be left to make me glad but the one I caused to be sad?