Two Kinds of Sorrow.

     For the sorrow that is according to the will of God produces a repentance without regret, leading to salvation, but the sorrow of the world produces death.
                             2 Corinthians 7:10 NASB

     There are two kinds of sorrow mentioned here. On the on hand there is the sorrow that the world boasts of. This is the sorrow over being caught in our sin. This kind of sorrow is concerned with self. It seeks to get out of punishment. Any promises made to God in this case are merely self serving bargains. Sins given up in our own self interests are considered legalism.
     There is also that sorrow for sin. This is the sorrow that understands that God has been offended by our sin. This type of sorrow leads us to confess and forsake our sin for God's sake. This individual does not want to grieve the Savior. He seeks mercy and reconciliation, grieving over the sin that sent Christ to the cross. His repentance flows out of a desire to now please his Savior.
     One leads to death, one to salvation