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The glimpse comes and the glimpse goes, suddenly or slowly, and this coming and this going are independent of his will. This does not, however, mean that he is totally helpless in the matter. Instruction or experience or both can teach him what those conditions are which assist the onset of the glimpse and those which obstruct it.
-- Notebooks Category 22: Inspiration and the Overself > Chapter 5 : Preparing for Glimpses > # 52