Blessed are the peacemakers: for they shall be called the children of God.
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Augustine of Hippo
City of God, book 19, ch. 13: Peace is the fixedness of order; by order, I meanan arrangement of things like and unlike giving to each its own place. And as there is no man who would not willingly have joy, so is there no man who would not have peace; since even those who go to war desire nothing more than by warto come to a glorious peace.
Retract., i, 19: No man can attain in this life that there be not in his members a law resisting the law of his mind. But the peacemakers attain thus far by overcoming the lusts of the flesh, that in time they come to a most perfect peace.
Or, because peace is then perfect when there is no where any opposition, the peacemakers are called the sons of God, because nothing resists God, and the children ought to bear the likeness of their Father.