"Christianity came in here as before. It came startlingly with a sword and clove one thing from another. It divided the crime from the criminal. The criminal we must forgive unto seventy times seven. The crime we must not forgive at all." Source: G.K. Chesterton, Orthodoxy, Moody Publishers, 2009.
"If you have anything against any man, forgive it: you come here to receive forgiveness of sins, and thou also must forgive him that has sinned against you. Else with what face will you say to the Lord, Forgive me my many sins, if you have not yourself forgiven your fellow-servant even his little sins." [...]
"Stated boldly, charity certainly means one of two things – pardoning unpardonable acts, or loving unlovable people." Source: G.K. Chesterton, Orthodoxy, Moody Publishers, 2009.