Chapter 19 — Part II: The Sacraments — Penance
Section 61. Perfect contrition is an act of charity, emanating from what is called filial fear; hence it is clear that the measure of contrition and of charity should be the same. Since, therefore, the charity which we cherish towards God, is the most perfect love, it follows that contrition should be the keenest sorrow of the soul. God is to be loved above all things, and whatever separates us from God is therefore to be hated above all things. It is also worthy of note that to charity and contrition the language of Scripture assigns the same extent. Of charity it is said: Thou shalt love the Lord thy God with thy whole heart.' Of contrition the Lord says through the Prophet: Be converted with your whole heart.