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The fascination which follows the taking of those drugs which seem to have given instant mystic experience is deceptive. A scrutiny of such experience shows that there are liabilities because the seeming enlightenment is illusory, and the taker has no control over the drug and its effects--some of which can be quite bad. He has no means of judging in advance how tolerant his body and mind are towards it, whether it will give him nausea, sickness, headaches, nightmares, or momentary insanity instead of the alleged enlightenment.
-- Notebooks Category 10: Healing of the Self > Chapter 3 : The Origins of Illness > # 136