How would you ever learn unconditional love if you were married to someone who met all the conditions? How would you ever learn mercy, patience, longsuffering, heartfelt compassion if you were married to someone who never failed you, who was never difficult with you, who never sinned against you, who was never slow to acknowledge their sin or ask for forgiveness? How would you ever learn grace to pour out your favor on someone who did not deserve it if you were married to someone who was always deserving of all good things? The main purpose of marriage is that, through your marriage, you become conformed to the image of Jesus Christ. Marriage, I believe, is the greatest instrument of sanctification.

Paul Washer