Take heed to yourselves: If thy brother trespass against thee, rebuke him; and if he repent, forgive him. And if he trespass against thee seven times in a day, and seven times in a day turn again to thee saying, I repent; thou shalt forgive him. Luke 17:3-4, KJV
You know, there are some passages that should just stand on their own. They don't need any explanation. This is one of those.
Sweet Jesus, help us to forgive when it seems impossible. Amen