Counterfeit Repentance

"The first deceit of repentance is legal terror. A man has gone on long in sin. At last God arrests him, shows him what desperate hazard he has run, and he is filled with anguish. Within a while the tempest of conscience is blown over, and he is quiet. Then he concludes that he is a true penitent because he has felt some bitterness in sin. Do not be deceived: this is not repentance. Ahab and Judas had some trouble of mind. It is one thing to be a terrified sinner and another to be a repenting sinner. Sense of guilt is enough to breed terror. Infusion of grace breeds repentance. If pain and trouble were sufficient to repentance, then the damned in hell should be most penitent, for they are most in anguish. Repentance depends upon a change of heart. There may be terror, yet with no change of heart."

From The Doctrine of Repentance, by Thomas Watson.