Your description of marriage, along with the five apropos verses you provide, faithfully bear witness to the gravity of the sacrament.

Not long ago I finished reading C.S. Lewis's Mere Christianity, and he offers a wonderful analogy, comparing the bonding of a man and wife into one flesh/organism to a lock and a key that form one complete mechanism.

Luther's notion that committing to another human being for a lifetime is akin to attending a school of character is apt in that the journey inevitably features numerous ups and downs that will test the character or not only the individuals involved, but the relationship as a whole. Likewise, Lewis also explains that ceasing to be "in love" does not mean ceasing to love which, as a deep unity maintained by will, strengthened by habit, and reinforced by the grace of God, is what enables marriages to last.

As long as we constantly meditate on and adhere to God's advice concerning matrimony, then we will truly achieve His Will of reflecting Christ's relationship with His Church !