If someone has hurt or offended you, and you are so angry that you have never forgiven them, then according to the Bible, you have already been "handed over to the torturers."
"In anger his master turned him over to the jailers to be tortured, until he should pay back all he owed. This is how my heavenly Father will treat each of you unless you forgive your brother from your heart." Matthew 18:34,35
This amazing verse reveals that from God's heavenly perspective, the anger, hate, bitterness and resentment you feel towards someone who has wronged you is a "torture chamber." I find this to be quite an astonishing revelation about how loving my God really is, because from our sin-damaged, human viewpoint, these wronged feelings we all have experienced at one time or another appear to us to be "quite normal."
If I want to keep my sufferings to a minimum, then I certainly do NOT want to find myself inside a torture chamber. And so it is that God places a high priority on our need to forgive people who wrong us --otherwise our hostile feelings will do nothing but torment and torture us for most of our lives. So it is, then, that we forgive others for our own sakes. There is no pleasure in being tortured, and it is especially distressing to realize that we can cause our internal sufferings cease just by using the key of forgiveness to deliver ourselves from our own inner anguish.
Of course it is hard to forgive. When someone hurts us, it is the very natural tendency of sin-damaged humans to want that offending person to be hurt back! But take comfort in this: forgiveness is not really about them, it is about you! It is for your own mental health and well-being that you forgive others.
And also know this, that when you forgive someone, you are not excusing their evil. Instead, you are taking off of yourself the responsibility for their judgment and punishment, and are turning that job over to God, who makes this promise:
"'It is mine to avenge; I will repay,' says the Lord." Romans 12:1
