O God, who art Peace everlasting, whose
chosen reward is the gift of peace, and
who hast taught us that the peacemakers are
Thy children, pour Thy sweet peace into our
souls, that everything discordant may utterly
vanish, and all that makes for peace be sweet
to us forever
Gelasian, A.D. 492

Blessed are the peacemakers; for they
shall be called the children of God
Matthew 5:9