Roman Catechism 39.7

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

Section 7. In this Petition, therefore, we ought to be so disposed, that, acknowledging our sins in the bitterness of our souls, we may fly to God as to a Father, not as to a Judge, imploring Him to deal with us not according to His justice, but according to His mercy.