Colossians 3:15

"And let the peace of God rule in your hearts, to the which also ye were called in one body; and be ye thankful." "The peace of God." This is that which is fixed and steadfast. If on man's account indeed thou hast peace, it quickly comes to dissolution, but if on God's account, never. Although he had spoken of love universally, yet again he comes to the particular. For there is a love too which is immoderate; for instance, when out of much love one makes accusations without reason, and is engaged in contentions, and contracts aversions. Not this, saith he, not this do I desire; not overdoing things, but as God made peace with you, so do ye also make it. How made He peace? Of His own will, not having received anything of you. What is this? "Let the peace of God rule in your hearts." If two thoughts are fighting together, set not anger, set not spitefulness to hold the prize, but peace; for instance, suppose one to have been insulted unjustly; of the insult are born two thoughts, the one bidding him to revenge, the other to endure; and these wrestle with one another: if the Peace of God stand forward as umpire, it bestows the prize on that which bids endure, and puts the other to shame. How? by persuading him that God is Peace, that He hath made peace with us. Not without reason he shows the great struggle there is in the matter. Let not anger, he saith, act as umpire, let not contentiousness, let not human peace, for human peace cometh of avenging, of suffering no dreadful ill. But not this do I intend, he saith, but that which He Himself left. He hath represented an arena within, in the thoughts, and a contest, and a wrestling, and an umpire. Then again, exhortation, "to the which ye were called," he saith, that is, for the which ye were called. He has reminded them of how many good things peace is the cause; on account of this He called thee, for this He called thee, so as to receive a worthy prize. For wherefore made He us "one body"? Was it not that she might rule? Was it not that we might have occasion of being at peace? Wherefore are we all one body? and now are we one body? Because of peace we are one body, and because we are one body, we are at peace.

"And be ye thankful." For this is to be thankful, and very effectively, to deal with his fellow-servants as God doth with himself, to submit himself to the Master, to obey; to express his gratitude for all things, even though one insult him, or beat him. For in truth he that confesses thanks due to God for what he suffers, will not revenge himself on him that has done him wrong, since he at least that takes revenge, acknowledges no gratitude. But let not us follow him (that exacted) the hundred pence, lest we hear, "Thou wicked servant," for nothing is worse than this ingratitude. So that they who revenge are ungrateful.