Relationships cannot thrive on selfishness, so submit. We have spent most of this lesson describing the choice of loving without conditions. Here is a special instruction to husbands, but for all I think. Love is communicated in commitment, attention, spending time. These are important, but the overarching principle from the text is love.
Love is the golden chain that binds.
This is agape love. Good marriages will have other kinds of love present, friendship, family, sexual, passionate, but this is the foundation. Dr. Chapman merely mentions gifts, but the greatest gift is the gift of self. Christ gave himself. Here is love.