Summary: Members of one another, and loving the brethren as Christ loved us.
Members one of another (Ephesians 4:25-32)
All of our relationships within the body of Christ must be governed by the Christian law of love (Ephesians 4:2).
One of the practical reasons given for “putting away the lie” (as the Greek of Ephesians 4:25 reads) is that we are members of one another. We are to work in order that we might have the wherewithal to give to those in need (Ephesians 4:28). Our conversation is to be for building up and edification, ministering grace to others (Ephesians 4:29).
We must never forget that we are a forgiven people, and therefore we must be forgiving towards others (Ephesians 4:32).
Love as He loved (Ephesians 5:1-2)
When we are followers of God, we will walk in love toward one another. We have the example of Jesus, who loved us and gave Himself for us. His love was a sacrificial love, and His sacrifice acceptable to God (Ephesians 5:2).
He has brought us into the family of God, and therefore we have responsibility towards one another as brethren (Psalm 133:1).