love this:

"When a couple speaks their vows & consummates their vows with sexual union, it is not man or woman or pastor or parent who is the main actor. God is. God joins a husband & wife into a one-flesh union. God does that. God does that!! Marriage is GOD'S doing... Staying married, therefore, is not about staying in love: it is about keeping covenant. Christ will never leave His wife." ~Piper