The comprehensive command to do all things in the name of the Lord is now applied to everyday household relationships. The Lord wants our social relationships to be sanctified. Paul first deals with marriage and family.
Paul continues on the topic of Christian harmony, giving instructions about the peace of Christ and the word of Christ. He also commands that all actions be done in line with the character and authority of the Lord Jesus.
Paul here continues his rationale for our submission to Christ alone with imagery of our forgiveness as spiritual death and life. He also speaks of Christ’s victory over the spiritual realm.