What keeps the marriage going is your commitment to your spouse’s holiness. You’re committed to his or her beauty. You’re committed to his greatness and perfection. You’re committed to her honesty and passion for the things of God.
Love as distinct from “being in love” is not merely a feeling. It is a deep unity, maintained by the will and deliberately strengthened by habit; reinforced by the grace which both partners ask, and receive from God. They can have this love for each other even at those moments when they do not like each other; as you love yourself even when you do not like yourself