From several different sources a variety of suggestive influences play upon the student's mind and habits, influences which may be all very well for others but which may be harmful to his own individuality at his particular stage of spiritual progress. This is true not only of the trivial affairs of everyday living but also of the loftier affairs of aspirational living. White truths and black falsehoods, cleverly combined half-truths and half-falsehoods are continually being presented to his consciousness. Not only his physical life, but also his mental life must become a process of careful acceptance and vigilant rejection. At a certain stage of this quest the seeker must be particularly careful to be on his guard against the skilfully suggested "truths" of others who mistake their own candle-glimmer for the sun's glory and the prejudices born of their own narrow experience for the wisdom born of insight. This caution is especially necessary in the sphere of mystical experience.
-- Notebooks Category 1: Overview of the Quest > Chapter 5 : Self-Development > # 442
