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The power which is felt is what the Hindus call kundalini, and it is gradually generated over the many years through which he practised meditation and sublimated sex. Usually when allowed to pass out of the head it leads to a spiritual experience of ecstatic illumination, but of course that can be done only when it is accepted without fear and in full faith. Its activity sometimes interferes with sleep for several months, but not usually longer.
-- Notebooks Category 5: The Body > Chapter 8 : Kundalini > # 9