William Burkitt on Colossians 3:15

As if the apostle had said, "Let that peace which God has given you within, and calleth you to exercise without, govern your lives, and direct you in all your actions towards men, and live in continual thankfulness to God!"

Here note, That the original word to rule in the heart, signifies to umpire, or to act the part of an umpire, in appeasing strife.

Now, this peace, 1. Inwardly hushes and stills all in the soul, the tumultuous affections are up, and in an hurry; when anger, hatred, and revenge begin to rise in the soul, this calms and composes all.

2. Outwardly, peace of conscience produces peaceableness of conversation; where the peace of God rules in the heart, it disposes it to peaceableness in the life.

Now, this consists in these things, namely, in an unwillingnesss to provoke others, in an unaptness to be provoked by others, in a readiness to be to be reconciled when provoked, and in a forwardness to reconcile others that are at variance.