For godly sorrow works repentance to salvation not to be regretted: but the sorrow of the world works death.
All Commentaries on 2 Corinthians 7:10 Go To 2 Corinthians 7
John Chrysostom
AD 407
Paul was regretful before he saw the fruit of repentance, but afterward he rejoiced. This is the nature of godly sorrow. Worldly sorrow, in contrast to this, is regret for the loss of money, reputation and friends. That kind of sorrow merely leads to greater harm, because the regret is often a prelude to a thirst for revenge. Only sorrow for sin is really profitable.