Roman Catechism 39.5

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

Section 5. Dispositions with which this petition should be Offered — Since, however, to obtain what we ask we must pray in a becoming manner, it appears expedient to explain the disposition with which this prayer should be offered to God.