What is godly regret?

2 Corinthians 7:9-10 As it is, I rejoice, not because you were grieved, but because you were grieved into repenting. For you felt a godly grief, so that you suffered no loss through us.  For godly grief produces a repentance that leads to salvation without regret, whereas worldly grief produces death. John Piper, in a … More What is godly regret?