He must climb out of the dark pit of emotional resentment and self-pity into which the blows of life throw him. He should extirpate all the human and pardonable weakness which made him unhappy. He should be big-hearted and generous towards the failings of others who, he feels, have wronged him. It is a grand chance to make a quick spurt in his spiritual progress if he could change from the conventional emotional reaction to the philosophic and calmer one, if he could rise at one bound above what Rupert Brooke called "the long littleness of life." He should not continue to bear resentment against those who have wronged him, nor to brood over what they have done; let him forget the mean, the sordid, and the wicked things other people do and remember the great, the noble, and the virtuous things that he seeks to do. Follow Jesus' example and cheerfully forgive, even unto seventy times seven. By his act of forgiveness to them, he will be forgiven himself for the wrongs he also has done. In their pardon lies his own. This is the law. In this way he demonstrates that he is able to leap swiftly from the present self-centered standpoint to a higher one, and he deals the personal ego a single paralysing blow. This is without doubt one of the hardest efforts anybody can be called upon to make. But the consequences will heal the wounds of memory and mitigate the pains of adversity.
-- Notebooks Category 2: Overview of Practices Involved > Chapter 5 : Balance the Psyche > # 56