Chapter 19 — Part II: The Sacraments — Penance
Section 54. Contrition Produces Sorrow — But although contrition is defined as sorrow, the faithful are not thence to conclude that this sorrow consists in sensible feeling; for contrition is an act of the will, and, as St. Augustine observes, grief is not penance but the accompaniment of penance. By sorrow the Fathers understood a hatred and detestation of sin; in the first place, because the Sacred Scriptures frequently use the word in this sense. How long, says David, shall I take counsels in my soul, sorrow in my heart all the day. And secondly, because from contrition arises sorrow in the inferior part of the soul which is called the seat of concupiscence.