“As the Lord has forgiven you, so you also must forgive”—your spouse. As the Lord “bears with” you, so you should bear with your spouse. The Lord “bears with” you everyday as you fall short of his will. Indeed, the distance between what Christ expects of you and what you achieve is infinitely greater than the distance between what you expect of your spouse and what he achieves. Christ always forgives more and endures more than we do. Forgive as you have been forgiven. Bear with as he bears with you. This holds for whether you are married to a believer or an unbeliever. Let the measure of God’s grace to you in the cross of Christ be the measure of your grace to your spouse.
"And if you are married to a believer, you can add this: As the Lord counts you righteous in Christ, though you are not in actual behavior or attitude, so count your spouse righteous in Christ, though he is not—though she is not. In other words, Colossians 3 says, take the vertical grace of forgiveness and justification and bend them out horizontally to your spouse. This is what marriage is for, most ultimately—the display of Christ’s covenant-keeping grace.
I'm a sinner; Michelle is a sinner. But with a foundation built on this kind of awesome grace, I believe we'll flourish until death parts us, even with our manifold flaws. I love this book, not least because it helps me love my beautiful bride a little bit more like the way Jesus loves His.