2 Corinthians 7:8-9

Even if my letter made you sorrowful, I don’t regret sending it (even though I felt awful for a moment when I heard how it grieved you). Now I’m overjoyed—not because I made you sad, but because your grief led you to a deep repentance. You experienced godly sorrow, and as God intended, it brought about gain for you, not loss, so that no harm has been done by us.