God speaks for Himself on the issue of forgiveness...
Be kind to one another, tenderhearted, forgiving one another, as God in Christ forgave you. Ephesians 4:32
And whenever you stand praying, forgive, if you have anything against anyone, so that your Father also who is in heaven may forgive you your trespasses. Mark 11:25
Do not repay evil for evil or reviling for reviling, but on the contrary, bless, for to this you were called, that you may obtain a blessing. I Peter 3:9
Love your enemies, bless those who curse you, do good to those who hate you, and pray for those who spitefully use you and persecute you. Matthew 5:44
Bear with each other and forgive one another if any of you has a grievance against someone. Forgive as the Lord forgave you. Colossians 3:13