Roman Catechism 39.41

Chapter 39 — Part IV: Prayer — The Fifth Petition: Forgive Us Our Trespasses as We Forgive Those Who Trespass Against Us

Section 41. Here, therefore, the pastor should explain the contrary desires of the flesh and of the spirit; that the former is prone to revenge, the latter ready to pardon; that hence a continual struggle and conflict goes on between them. Wherefore he should point out that although the appetites of corrupt nature are ever opposing and rebelling against reason, we are not on this account to be uneasy regarding salvation, provided the spirit persevere in the duty and disposition of forgiving injuries and of loving our neighbour.