§2841
Prayer › … › V. "And Forgive Us Our Trespasses, As We Forgive Those Who Trespass Against Us"
This petition is so important that it is the only one to which the Lord returns and which he develops explicitly in the Sermon on the Mount. This crucial requirement of the covenant mystery is impossible for man. But "with God all things are possible."
Source: Catechism of the Catholic Church (Vatican.va)