The peace of Christ (hē eirēnē tou Christou). The peace that Christ gives (Joh 14:27).
Rule (brabeuetō). Imperative active third singular of brabeuō, to act as umpire (brabeus), old verb, here alone in N.T. See note on 1Co 7:15 for called in peace.
In one body (en heni sōmati). With one Head (Christ) as in Col 1:18, Col 1:24.
Be ye thankful (eucharistoi ginesthe). “Keep on becoming thankful.” Continuous obligation.