What comes from above? The Holy Spirit of God through Jesus Christ. To be born from above means to be born of the Spirit; for God’s Spirit to enliven us, to give us life—a new life—that is impossible without him. The birth from above results from the union of my spirit with God’s Spirit and results in a new life. Just as the union of two bodies creates new bodily life, this union creates new spiritual life.
I don't have time to say much more than that but it does help answer a question I've had for a long time: What is the significance of marriage, that God would have such definite rules about it? Marriage is the bodily symbol of this union of spirit to Spirit.
What are your thoughts on this?