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When the individual is entirely introspective, when he no longer knows or wants to know his physical environment, he may become wrapped up in ideas or images which thereby assume vivid reality or he may fall into a state of utter blankness. If his preparation and training have been correct, he may be touched by the higher consciousness. But if he is spiritually unprepared and philosophically untrained, he may become the victim of an unseen disincarnate mind; in short, he may become a medium.
-- Notebooks Category 16: The Sensitives > Chapter 13 : The Occult > # 112