2841-2845
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."
. . . as we forgive those who trespass against us
This "as" is not unique in Jesus' teaching: "You, therefore, must be perfect, as your heavenly Father is perfect"; "Be merciful, even as your Father is merciful"; "A new commandment I give to you, that you love one another, even as I have loved you, that you also love one another." It is impossible to keep the Lord's commandment by imitating the divine model from outside; there has to be a vital participation, coming from the depths of the heart, in the holiness and the mercy and the love of our God. Only the Spirit by whom we live can make "ours" the same mind that was in Christ Jesus. Then the unity of forgiveness becomes possible and we find ourselves "forgiving one another, as God in Christ forgave" us.
Thus the Lord's words on forgiveness, the love that loves to the end, become a living reality. The parable of the merciless servant, which crowns the Lord's teaching on ecclesial communion, ends with these words: "So also my heavenly Father will do to every one of you, if you do not forgive your brother from your heart." It is there, in fact, "in the depths of the heart," that everything is bound and loosed. It is not in our power not to feel or to forget an offense; but the heart that offers itself to the Holy Spirit turns injury into compassion and purifies the memory in transforming the hurt into intercession.
Christian prayer extends to the forgiveness of enemies, transfiguring the disciple by configuring him to his Master. Forgiveness is a high-point of Christian prayer; only hearts attuned to God's compassion can receive the gift of prayer. Forgiveness also bears witness that, in our world, love is stronger than sin. The martyrs of yesterday and today bear this witness to Jesus. Forgiveness is the fundamental condition of the reconciliation of the children of God with their Father and of men with one another.
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 relationship. It is lived out in prayer, above all in the Eucharist.