§2845
Prayer › … › V. "And Forgive Us Our Trespasses, As We Forgive Those Who Trespass Against Us"
. . . As we forgive those who trespass against us
There is no limit or measure to this essentially divine forgiveness, whether one speaks of "sins" as in Luke (⇒ 11:4), "debts" as in Matthew (⇒ 6:12). We are always debtors: "Owe no one anything, except to love one another." The communion of the Holy Trinity is the source and criterion of truth in every relation ship. It is lived out in prayer, above all in the Eucharist.
God does not accept the sacrifice of a sower of disunion, but commands that he depart from the altar so that he may first be reconciled with his brother. For God can be appeased only by prayers that make peace. To God, the better offering is peace, brotherly concord, and a people made one in the unity of the Father, Son, and Holy Spirit.
Source: Catechism of the Catholic Church (Vatican.va)