I came across one of the most powerful / convicting insights on forgiveness:
“Only one thing I know costs more than forgiving someone. Know what it is? Not forgiving them. Non-forgiveness costs your heart. Frederick Buechner wrote that of all the deadly sins, resentment appears to be the most fun. To lick your wounds and savor the pain you will give back is in many ways a feast fit for a king. But then it turns out that what you are eating at the banquet of bitterness is your own heart. The skeleton at the feast is you. You start out holding a grudge, but in the end the grudge holds you.”–John Ortberg
Matt. 18:21-35
21Then Peter came to Jesus and asked, “Lord, how many times shall I forgive my brother when he sins against me? Up to seven times?”
22Jesus answered, “I tell you, not seven times, but seventy-seven times.
23“Therefore, the kingdom of heaven is like a king who wanted to settle accounts with his servants. 24As he began the settlement, a man who owed him ten thousand talents was brought to him. 25Since he was not able to pay, the master ordered that he and his wife and his children and all that he had be sold to repay the debt.
26“The servant fell on his knees before him. ‘Be patient with me,’ he begged, ‘and I will pay back everything.’ 27The servant’s master took pity on him, canceled the debt and let him go.
28“But when that servant went out, he found one of his fellow servants who owed him a hundred denarii. He grabbed him and began to choke him. ‘Pay back what you owe me!’ he demanded.
29“His fellow servant fell to his knees and begged him, ‘Be patient with me, and I will pay you back.’
30“But he refused. Instead, he went off and had the man thrown into prison until he could pay the debt. 31When the other servants saw what had happened, they were greatly distressed and went and told their master everything that had happened.
32“Then the master called the servant in. ‘You wicked servant,’ he said, ‘I canceled all that debt of yours because you begged me to. 33Shouldn’t you have had mercy on your fellow servant just as I had on you?’ 34In anger his master turned him over to the jailers to be tortured, until he should pay back all he owed.
35“This is how my heavenly Father will treat each of you unless you forgive your brother from your heart.”