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Anyone who hears voices that have no physical origin should immediately stop whatever practice--occult, psychic, meditational, necromantic, or religious--he or she has been following, should take a holiday from all such interests for a time and get back to the normal, the outgoing, and the ordinary. Otherwise there is the peril of madness or obsession.
-- Notebooks Category 16: The Sensitives > Chapter 13 : The Occult > # 91