He must try to understand the inner meaning of such happenings. The more he meets with criticism and enmity, the more he must ask himself what truth they contain. And he himself must provide the answer with perfect impartiality. If they contain no truth at all, so much the better. But such self-examination cannot be properly done if he allows emotion to get the upper hand, especially the emotions of resentment against his critics and bitterness against his opponents.
-- Notebooks Category 6: Emotions and Ethics > Chapter 5: Spiritual Refinement > # 272