The constant nagging of those with whom he is compelled to live, work, or associate, so far as there is any truth in their exaggerations or misunderstandings, can be made to serve a most useful purpose by arousing in him the necessity of change and self-improvement. However much his self-love is wounded and however long it may take to achieve this and to correct his faults, he will only profit by it. With his success a separation may occur, and they may be set free to go their own way. It may be brought about by their own voluntary decisions or by the compulsion of destiny. When a relationship is no longer useful to evolution or karmically justified, an end will come to it. This acceptance of other people's criticisms, humbly and without resentment, may be compared to swimming against the current of a stream. Here the stream will be that of his own nature. In this matter he should look upon the others as his teachers--taking care however to separate the emotional misunderstandings and egoistic exaggerations from the actual truth. He is to regard the others as sent by the Overself to provoke him into drawing upon or deliberately developing the better qualities needed to deal with such provocations, and not only to show him his own bad qualities.
-- Notebooks Category 6: Emotions and Ethics > Chapter 1 : Uplift Character > # 481