Excerpt from What God Requires, Christ Provides by John Piper and Justin Taylor
I have a family to care for. My marriage must survive and thrive for the good of our children and the glory of Christ. God designed marriage to display the holy mercy of Christ and the happy submission of his church (see Eph. 5:21-25). Here the doctrine of justification by faith and the imputed righteousness of Christ can be a great marriage saver and sweetener.
Marriage seems almost impossible at times because both partners feel so self-justified in their expectations that are not being fulfilled. There is a horrible emotional dead end in the words, “But it’s just plain wrong for you to act that way,” followed by “That’s your perfectionistic perspective” or “Do you think you do everything right?” or by hopeless, resigned silence. The cycle of self-justified self-pity and anger can seem unbreakable.