While not easy, is simple

Be kind to one another, tenderhearted, forgiving one another, even as God in Christ forgave you. (Ephesians 4:32 NKJV)

 I know what it’s like to be wrongfully hurt. I know abuse. I know suffering … You know what men did to Me, at the instigation of evil men. […]
 My coming to earth, My suffering for you, My atonement for your sins was the ultimate act of forgiveness. My act of suffering and dying in your place was a choice made out of love—love for each individual that makes up humanity.
 That love was not limited or selective. That love was for all. That love even included a love for those who tortured and executed Me, and a love for those who loved Me but fled in My hour of need. I forgave them all. And throughout history, I have accepted and forgiven anyone who has come to Me to receive My salvation.
 Forgiveness, while not easy, is simple. Salvation and forgiveness are both a part of My divine nature, and a part of My nature that you can share in. When you accept salvation, you accept My love, and you accept My forgiveness; and you also receive divine power to help you to love and forgive others. —Jesus [1]

 One of the secrets of a long and fruitful life is to forgive everybody, everything, every night before you go to bed.—Bernard M. Baruch

[1] Anchor Debts and Debtors