Our purpose is...

...that they may be encouraged in heart and united in love, so that they may have the full riches of complete understanding, in order that they may know the mystery of God, namely, Christ - Colossians 2:2

Love is critical to the success of your marriage. Not your current feelings of romance. Not a stronger financial standing. Not even your spouse's behavior. Love is infinitely more valuable than these. They will pass away, but love remains. You can be fulfilled without these, but not without love.