'Harmony' in the Bible

Beyond all these things put on and wrap yourselves in [unselfish] love, which is the perfect bond of unity [for everything is bound together in agreement when each one seeks the best for others].

Let the peace of Christ [the inner calm of one who walks daily with Him] be the controlling factor in your hearts [deciding and settling questions that arise]. To this peace indeed you were called as members in one body [of believers]. And be thankful [to God always].