In the Gospel of Mark, the Pharisees came to Jesus wanting to know if it was lawful for a man to divorce his wife.
Jesus engaged these men in a discussion based on Scripture. In effect he said, "Before you can understand anything about divorce, you need to understand what a marriage is." And this is also what you and I need to understand.
Now notice what Mark 10:6 says. It says: "But from the beginning of creation, ‘God made them male and female.'" He's saying God created man and woman, and when he did so, he established the very beginning of society... the very beginning of life... and the exclusive union of marriage.
Marriage is a profoundly spiritual, social, and biological union. It's just as much a spiritual bond as it is a social and sexual bond. And that bond reaches to the very depths of our beings. It's sacred.
That's what the Scripture is talking about when it says "two shall become one." And for that very reason, to get a divorce is like dismembering your own body.
Don't make the mistake of thinking that marriage is just a human tradition. Marriage is God's creation. Enter into it carefully and thoughtfully.
Taken from "What is Marriage, Really?" by PowerPoint Ministries (used by permission).