Contrition, or sorrow for sin, is a hatred of sin and a true grief of the soul for having offended God, with a firm purpose of sinning no more.
Why should we be sorry for our sins?
We should be sorry for our sins, because sin is the greatest of evils and an offense against God our Creator, Preserver, and Redeemer, and because mortal sin shuts us out of heaven and condemns us to the eternal pains of hell.
What do you mean by a firm purpose of sinning no more?
By a firm purpose of sinning no more I mean a fixed resolve not only to avoid all mortal sin, but also its near occasions.
What do you mean by the near occasions of sin?
By the near occasions of sin I mean all the persons, places, and things that may easily lead us into sin.