1 + 1 = 1—this is the formula for marriage. Marriage is God turning two hydrogen into one helium. It’s fusion. But first, marriage is fission. A man must leave his mother and father and cleave to his wife. Family ties are near strongest. They have a-bomb power; fission power. Marriage is stronger. Marriage has star power; fusion power.
Marriage is held together by the strongest glue—Trinitarian strength glue. Only the triune God could be the author of such a mystery as 1 + 1 = 1. God made man in His own image and He made man male and female. One way that man images forth God is in marriage. There are many junk illustrations for the Trinity (water in three forms, clovers, an egg, etc.) but there is only one authorized metaphor. Marriage, though a limited analogy, it is an analogy after all, is a legitimate one, the best one (cf. 1 Corinthians 11:3).
How permanent is marriage supposed to be? As permanent as the Triune God. One man, one woman, forever, till death do them part and usher them fully into the eternal reality of which their earthly marriage was just a shadow. Anything less isn’t marriage, it’s “mar-age.”
Let not man do fission where God has done fusion. When you toy with divorce you need to know you are playing with a nuclear warhead. You can’t seek to undo God’s work without the effects being cataclysmic.