For if you forgive men their trespasses, your heavenly Father will also forgive you:
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Augustine of Hippo
Nor are we indeed carelessly to pass by the circumstance, that of all those sentences in which the Lord has taught us to pray, He has judged that that one is chiefly to be commended which has reference to the forgiveness of sins: in which He would have us to be merciful, because it is the only wisdom for escaping misery. For in no other sentence do we pray in such a way that we, as it were, enter into a compact with God: for we say, Forgive us, as we also forgive. And if we lie in that compact, the whole prayer is fruitless. For He speaks thus: For if you forgive men their trespasses, your heavenly Father will also forgive you: But if you forgive not men their trespasses, neither will your Father forgive your trespasses.