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The monk who gets too wrapped up in himself and his moods, too locked up inside other-worldly experiences, too cut off from the facts and realities of everyday living, and unable to test by them the illusions and hallucinations which his imagination produces and his meditation confirms may tread the edge of a precipice over which he may topple into insanity.
-- Notebooks Category 16: The Sensitives > Chapter 3 : Philosophy, Mysticism, and The Occult > # 31