Submitting yourselves one to another in the fear of God.
Note 36 at Eph 5:21: In the remainder of this chapter, Paul went on to teach about marriage. One of the important lessons he gave is on the submission of wives to their husbands. Before he mentioned that, however, he said we are supposed to submit ourselves one to another in the fear of God (see note 37 at this verse). That means that submission is not a one-sided thing. Even husbands are to submit to their wives.
Note 37 at Eph 5:21: Notice that this submission is "in the fear of God." The Scripture does not teach anyone ever to disobey God in an attempt to submit to someone else (see note 2 at Eph 5:22).