'Godly Sorrow' in the Bible

For a godly sorrow works repentance unto salvation not to be regretted; but the sorrow of the world works out death.

For behold, how great enthusiasm, yes, how great apology, yes, how great clearing up, yes, how great fear, yes, how great longing, yes, how great zeal, yes, how great avenging, this same godly sorrow did work in you! In everything you have established yourselves to be pure in the matter.