But if Confession does not stop sin what is the good of it?

Confession is an immense help in the prevention of further sin. Remember that Christ did not institute this Sacrament precisely to prevent further sin, but to forgive sin once it has been unhappily committed. To prevent sin there are other Sacraments, and other means such as good example, religious instruction, prayer, and the grace of God. But if, in spite of these helps, a man falls through strong temptation, as anyone is likely to do, it is a very great good that his sin can be forgiven.

Radio Replies Volume 1 by Rev. Dr. Leslie Rumble MSC and Rev. Charles Mortimer Carty