Trent Moody explains in this video that couples ought to learn to quickly forgive past sins and to not bring the past up. Whenever there is an issue, a spouse should not quickly bring up their spouse's past faults and mistakes. Rather, they should demonstrate love and compassion.

Ephesians 4:32 (NKJV) - "And be kind to one another, tenderhearted, forgiving one another, even as God in Christ forgave you."

The pieces of advice I would have towards our four married couples would be this, learn the art of sanctified amnesia when it comes to their faults, your spouse's faults. Learn to not bring up the past. One of the best things that we can do, and I'm speaking to myself here because I need to learn to do this, is whenever there is an issue that we need to discuss, leave it in the present. Don't become historical. Oftentimes we want to remember all the faults, forget all the faults, and start right where we are today and forgive and love and be humble and live for the glory of God and to bring joy and pleasure to your spouse.