God is “rich in mercy” (Ephesians 2:4). Entry into His Kingdom is established upon the principles of grace, mercy, and forgiveness. To live in His Kingdom is to experience the grace, mercy, and forgiveness of God on a daily basis. The nature of the Kingdom reflects the character of its King. If this is so, how can we claim to be representatives of this Kingdom of Love and refuse to forgive as freely as we have been forgiven? If we have been forgiven by God then we have an obligation to forgive others – not for their sake, not for our sake, but for the sake of the Kingdom.
It would be inconceivable to claim to be a king and priest of a Kingdom based on forgiveness of sins and, at the same time, allow unforgiveness and bitterness to remain in our personal life. It will be difficult for people to believe God can forgive them if His own people are unable or unwilling to forgive one another.