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The concentration upon the glimpse must be full, complete, and sustained. If, for only a single moment, he allows his attention to be diverted toward some outer thing or person, or to be divided with some inner idea, the glimpse may instantly disappear.
-- Notebooks Category 22: Inspiration and the Overself > Chapter 5 : Preparing for Glimpses > # 168
-- Perspectives > Chapter 22: Inspiration and the Overself > # 74