Ephesians 5:21

Here the apostle begins his exhortation to the discharge of relative duties. As a general foundation for these duties, he lays down that rule Eph 5:21. There is a mutual submission that Christians owe one to another, condescending to bear one another's burdens: not advancing themselves above others, nor domineering over one another and giving laws to one another. Paul was an example of this truly Christian temper, for he became all things to all men. We must be of a yielding and of a submissive spirit, and ready to all the duties of the respective places and stations that God has allotted to us in the world. In the fear of God, that is, so far as is consistent with the fear of God, for his sake, and out of conscience towards him, and that hereby we may give proof that we truly fear him. Where there is this mutual condescension and submission, the duties of all relations will be the better performed. From Eph 5:22 to the end he speaks of the duties of husbands and wives; and he speaks of these in a Christian manner, setting the church as an example of the wife's subjection, and Christ as an example of love in husbands. I. The duty prescribed to wives is submission to their husbands in the Lord (Eph 5:22), which submission includes the honouring and obeying of them, and that from a principle of love to them.

— Matthew Henry's Concise Commentary (public domain)

(Phi 2:3; Pe1 5:5.) Here he passes from our relations to God, to those which concern our fellow men. in the fear of God--All the oldest manuscripts and authorities read, "in the fear of CHRIST." The believer passes from under the bondage of the law as a letter, to be "the servant of Christ" (Co1 7:22), which, through the instinct of love to Him, is really to be "the Lord's freeman"; for he is "under the law to Christ" (Co1 9:21; compare Joh 8:36). Christ, not the Father (Joh 5:22), is to be our judge. Thus reverential fear of displeasing Him is the motive for discharging our relative duties as Christians (Co1 10:22; Co2 5:11; Pe1 2:13).

— Jamieson-Fausset-Brown Commentary (public domain)