2 Corinthians 7:9-11

Now I am happy, not because you were made sad, but because your sorrow made you change your lives. You became sad in the way God wanted you to, so you were not hurt by us in any way. The kind of sorrow God wants makes people change their hearts and lives. This leads to salvation, and you cannot be sorry for that. But the kind of sorrow the world has brings death. See what this sorrow—the sorrow God wanted you to have—has done to you: It has made you very serious. It made you want to restore yourselves. It made you angry and afraid. It made you want to see me. It made you care. It made you want to do the right thing. In every way you have regained your innocence.