It takes a work of faith to forgive others. The Lord will give us this faith if we come before Him like the beggar of which Jesus spoke when He said, Blessed are the poor in spirit: for theirs is the Kingdom of Heaven—Matthew 5:3.
Forgiveness opens all the blessings of Heaven’s Kingdom to us. This passage from Luke points us toward this good way.
Luke 6:36,37—Be ye therefore merciful, as your Father also is merciful. Judge not, and ye shall not be judged: condemn not, and ye shall not be condemned: forgive, and ye shall be forgiven...
(MSG) 35-38 "I tell you, love your enemies. Help and give without expecting a return. You'll never—I promise—regret it. Live out this God-created identity the way our Father lives toward us, generously and graciously, even when we're at our worst. Our Father is kind; you be kind. "Don't pick on people, jump on their failures, criticize their faults— unless, of course, you want the same treatment. Don't condemn those who are down; that hardness can boomerang. Be easy on people; you'll find life a lot easier. Give away your life; you'll find life given back, but not merely given back—given back with bonus and blessing. Giving, not getting, is the way. Generosity begets generosity."
Luke 17:3-5—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. And the apostles said unto the Lord, Increase our faith.
(MSG) "Be alert. If you see your friend going wrong, correct him. If he responds, forgive him. Even if it's personal against you and repeated seven times through the day, and seven times he says, 'I'm sorry, I won't do it again,' forgive him." The apostles came up and said to the Master, "Give us more faith."