Genesis 2:18–25: Why God Made One Flesh
Genesis 2:18–25 grounds marriage in God's own act of making, bringing, and joining. Sexual intimacy belongs inside the one flesh union the text describes, and that union is God's design before it is anyone's idea.
Genesis 2:18–24: God's Design for Marriage
Genesis 2:18–24 presents marriage as God's provision for the not-good condition of aloneness, with its shape set by the Creator rather than the couple. Strength in marriage rests on that design, not on technique.
Mark 10:6–9: God Joins, No One Separates
Jesus answers a question about divorce by going back before Moses to the beginning of creation. Marriage is first God's act of joining, which is why Jesus treats it as more than a private contract.