That illusive state of grace that incorporates all of life's well-being. Because of Jesus, we have true shalom - wellness in body, soul, and spirit. His relationships with others, his victory over sin, death and the grave insures that we can have peace, too! So as we receive the Spirit of Christ into our hearts, we can live with our brothers and sisters, no matter how flawed, in a state of peace. Besides, as Paul changes metaphors on us, we are the Body of Christ and of course a body does not want to be at war with itself. So live in peace with others, and do so with thanksgiving.
Let the peace of Christ rule in your hearts, since as members of one body you were called to peace. And be thankful.
If we have no peace, it is because we have forgotten that we belong to each other.