+Mt 5: 43-48
“You have heard that it was said, ‘You shall love your neighbor and hate your enemy.’
But I say to you, love your enemies, and pray for those who persecute you,
that you may be children of your heavenly Father, for he makes his sun rise on the bad and the good, and causes rain to fall on the just and the unjust.
For if you love those who love you, what recompense will you have? Do not the tax collectors do the same?
And if you greet your brothers only, what is unusual about that? Do not the pagans do the same?
So be perfect, just as your heavenly Father is perfect.
The New American Bible
The Catechism of the Catholic Church
. . . as we forgive those who trespass against us
2842 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.
2843 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.
2844 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.
2845 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.