24 The Holy Spirit warns us, and says, “What man is he that desires to live, and would fain see good days? Refrain your tongue from evil, and your lips that they speak no guile. Eschew evil, and do good; seek peace, and ensue it.” The son of peace ought to seek peace and ensue it. He who knows and loves the bond of charity, ought to refrain his tongue from the evil of dissension. Among His divine commands and salutary teachings, the Lord, when He was now very near to His passion, added this one, saying, “Peace I leave with you, my peace I give unto you.” He gave this to us as an heritage; He promised all the gifts and rewards of which He spoke through the preservation of peace. If we are fellow-heirs with Christ, let us abide in the peace of Christ; if we are sons of God, we ought to be peacemakers. “Blessed,” says He, “are the peacemakers; for they shall be called the sons of God.” It behooves the sons of God to be peacemakers, gentle in heart, simple in speech, agreeing in affection, faithfully linked to one another in the bonds of unanimity.
Source: The Treatises of Cyprian (New Advent)