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Philosophy recognizes that the human mind cannot even grasp the concept of the Void that is a Spirit save after a long course of study and reflection, much less realize it. Therefore it provides for this situation by offering a Symbol of that Void, a picture or an idea of which the mind can easily take hold as a preliminary until he can make the direct attempt.
-- Notebooks Category 4: Elementary Meditation > Chapter 5 : Visualizations, Symbols > # 74