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It is not the original revelation of the Overself which they communicate or transmit but the impact of the revelation upon their own mentality. A prism does not transmit the pure white light which strikes against it but only the several colours of the spectrum into which it breaks that light. The mystic's mentality is like a prism and breaks the pure being of the Overself into the egoistic colours of ideas and beliefs.
-- Notebooks Category 16: The Sensitives > Chapter 9 : Inspiration and Confusion > # 76