"Paul was better acquainted with his own sinfulness than he was anyone else’s. Of course Paul knew, theoretically, that other people were every bit the sinner he was, but he was so much more aware of his sin than he was theirs. When Paul thought about a need for grace, he didn’t think of others first—he thought of himself...
When you really believe the gospel, you see that you are first a sinner and only secondarily sinned against. The problem in your marriage is that neither of you seems aware of how much you’ve been forgiven. Because you haven’t really tasted grace, you won’t extend grace to each other. You need to go back to the gospel."
J.D. Greear, Gospel: Recovering the Power that Made Christianity Revolutionary