Many of us are trapped in a maze of keeping rules and regulations that we think is Christianity. We have reduced the gospel to an ethical system. We know intellectually the story of Jesus, we have taken Christianity 101 in CCD or religious ed. Who among us that is married, would accept a marriage to a person on the other side of the world, to a person I would never see, touch, hear, smell or be intimate with in any way. All I would know of this person would be what I read about him or her.
Marriage is a union in spirit, soul and body.
Hence, all depends on faith, everything is grace. There are various kinds of faith. The bible is talking about a faith that burns all its bridges behind it, that puts all its hope and trust in God's word and bets the farm on it. A faith that expects God to do for you personally what He says He will. I will settle for nothing less than what your Holy word promises.