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This exercise requires him to retract his attention inwards until, oblivious of his immediate surroundings, he intently projects certain suggestive mental images into this blankness and holds them determinedly yet calmly. The result will appear later in his ordinary state when the wakeful consciousness will seize these images abruptly and unexpectedly and effectively act upon their suggestions.
-- Notebooks Category 4: Elementary Meditation > Chapter 5 : Visualizations, Symbols > # 18