Colossians 3:15

Colossians 3:15 And let the peace of Christ arbitrate in your hearts, to which also you were called in one Body; and be thankful. 

According to the context of Colossians 3, when we set our mind on the things above, the divine element is transmitted into us for the renewing of the new man. As the new man is being renewed, we should allow the peace of Christ to arbitrate in our hearts. The renewing of the new man is actually the spreading of the new man within us. As the new man spreads, we need to let the peace of Christ arbitrate within us. 

- "Life Study of Colossians" P561