Matthew 19
So they are no longer two but one flesh. What therefore God has joined together, let not man separate.
John Piper comments on this passage in his book This Momentary Marriage
The magnificence of marriage in the mind of God will seem unintelligible in a modern Western culture, where the main idol is self; and its main doctrine is autonomy; and its central act of worship is being entertained; and its three main shrines are the television, the Internet, and the cinema; and its most sacred genuflection is the uninhibited act of sexual intercourse. Such a culture will find the glory of marriage in the mind of Jesus virtually incomprehensible.
The fact that we live in a society that can defend two men or two women entering a sexual relationship and, with wild inconceivability, call it marriage shows that the collapse of our culture into debauchery and anarchy is probably not far away.
I mention this cultural distortion of marriage in the hopes that it might wake you up to consider a vision of marriage higher and deeper and stronger and more glorious than anything this culture—or perhaps you yourself—ever imagined. The greatness and glory of marriage is beyond our ability to think or feel without divine revelation and without the illumining and awakening work of the Holy Spirit.
The highest meaning and the most ultimate purpose of marriage is to put the covenant relationship of Christ and his church on display. That is why marriage exists. If you are married, that is why you are married. If you hope to be, that should be your dream.