No believer lives a spiritually isolated life. Together, we are members of Christ's Body (Eph. 5:30) and have responsibilities to each other.
Ephesians 4:25 says, "We are members one of another." Therefore, Spirit-filled believers treat fellow Christians as they would treat themselves.
We are not to be domineering, but recognizing that Christ is the Lord of all, we are to have a submissive spirit. As we mutually desire to do the will of God, the Holy Spirit will give us a harmonious relationship with each other.
We are to submit ourselves to others "in the fear of God," which is a reverential fear lest we displease or dishonor God.
Because of all that Christ has done for us, our desire should be to please Him in everything we do. As we submit ourselves to Him and to others, the Devil is given no opportunity in our lives. Ephesians 4:27 tells believers, "Neither give place to the devil."
God gives the grace that is needed to resist the temptation to disrupt the harmony of believers: "But he giveth more grace. Wherefore he saith, God resisteth the proud, but giveth grace unto the humble. Submit yourselves therefore to God. Resist the devil, and he will flee from you" (James 4:6,7).
When we maintain this kind of relationship with Christ, through the Holy Spirit, we have the proper basis for the various relationships in life, some of which are mentioned in Ephesians 5.
"Now ye are the body of Christ, and members in particular" (1 Cor. 12:27).