If the aspirant has any grievance against another person or if he be conscious of feelings of anger, resentment, or hatred against another person, he should follow Jesus' advice and let not the sun go down on his wrath. This means that he must see him as expressing the result of all his own long experience and personal thinking about life and therefore the victim of his own past, not acting better only because he does not know any better. The aspirant should then comprehend that whatever wrongs have been done will automatically be brought under the penalty of karmic retribution. Consequently, it is not his affair to condemn or to punish the other person, but to stand aloof and let the law of karma take care of him. It is his affair to understand and not to blame. He must learn to accept a person just as he is, uncondemned. He certainly should try not to feel any emotional resentment or express any personal ill-will against that person. He must keep his own consciousness above the evil, the wrong-doing, the weaknesses, or the faults of the other man and not let them enter his own consciousness--which is what happens if he allows them to provoke negative reactions in his lower self. He should make immediate and constant effort to root such weeds out of his emotional life. But the way to do this is not by blinding himself to the faults, the defects, and the wrongdoings of the other. Nor is it to be done by going out of his way to associate with undesirables.
-- Notebooks Category 6: Emotions and Ethics > Chapter 1: Uplift Character > # 503