One day Peter had a question for Jesus that applies, as does all of Jesus' teachings, to us today. (I'm amazed that documents two milleniums old are still so relevant) "Lord, how often should I forgive someone who sins against me? Seven times?"
"No, not seven times," Jesus replied, "but seventy times seven."
So everyone gets four hundred and ninety forgivings from every Christian, right? No, the point is, an infinite amount of forgiveness is given to the offender. Afterall, how much were you and I forgiven for? Did we forget?
That last question is so easy to answer. Yes, we have forgotten. In reality, My family shouldn't even speak to me for the years I reigned in terror over their lives. I wasn't violent toward loved ones. Their terror was the thought of arguing with a self-indulging idiot, to drunk to converse with. But the good news is that they have been transformed by God's grace, and extend it my way.
AA's Big Book says, "Resentment is the "number one" offender. It destroys more alcoholics than anything else." (pg.64) No statement could be more accurate. We have to remember OUR offenses any and every time we are offended. The statement that is a knife to the throat of anyone in recovery for anything is, "I forgive them, but....
Jesus didn't forgive me, but..., that isn't how it works with Him. Because of Jesus, and my choice to believe in Him, God removes my sins forever from His memory. He sees Jesus when He looks at me. Because of this great fact, He requires no less of me than to forgive others in the same manner. I can because He lives in and through me.
Okay, I know we are not perfected just yet. Offenses are not forgotten. Jesus didn't say forget, He said forgive. Wisdom also comes from God. We should be wise enough to not allow ourselves to be offended in the same way, by the same person. Use that offense, and your godly wisdom to rememberyour past. Then take a moment to thank God for forgiving you. Also, read that passage in Matthew 18:21-25. This passage can show how we easily forget our forgiveness.