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An outwardly similar condition can be induced by artificial methods--such as suspension of breath, fixation of the gaze, or even hypnotizing of the mind--but it is only a counterfeit, only useful on its own physical and mental level, never on the mystical level which it is unable to touch. It has as much spiritual value as the hibernation of animals has. For the true condition does not really come through such effort of the ego, it comes by Grace. This is why the hatha yogi is warned not to get stuck in hatha yoga but to climb higher.
-- Notebooks Category 4: Elementary Meditation > Chapter 1 : Preparatory > # 451