Blessed are the peacemakers: for they shall be called the children of God.
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Theophylact of Ochrid
"The peacemakers" are not only those who are themselves peaceable with all, but also those who reconcile others who are at odds. "The peacemakers" are also those who by their teaching convert the enemies of God. Just as the Only-begotten Son reconciled us to God when we were His enemies, so too are the "peacemakers" "sons of God."