When I acknowledge a specific sin, it is a good thing to do something specific to demonstrate my determination to forsake it. Smash an altar, sacrifice an hour of sleep or a meal (if the sin has been, e.g., failure to do what I want to do "because I haven't time"), write a note of apology to one sinned against, make restitution in some way for a wrong. To arise and obey in such a particular act is an appropriate sign of the genuineness of my repentance--the fruit of forgiveness.