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Because chemical drugs can affect the mind, can induce states of consciousness, it is claimed that the excesses or the horrors which have been produced through their means show that spiritual consciousness is entirely related to the physical brain, that the greatest attainments of the yogis can be produced in a hour or two instead of many years or a lifetime by taking a simple drug, and that therefore modern science has achieved the opening of a door to spiritual self-realization which many would-be yogis have failed to achieve--in other words, that the Kingdom of Heaven is not within you but within a pill or a tablet.
-- Notebooks Category 10: Healing of the Self > Chapter 3 : The Origins of Illness > # 146