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There is a practice by which a man can put himself into a passive condition by quietening his thoughts. But if this passivity is not directed by aspiration towards the higher consciousness, towards the holier sources, it may be turned into mere mediumship directed not to spirits but to other living persons. In this way he may become sensitive to other peoples' emotional-mental condition but will not have the higher consciousness.
-- Notebooks Category 4: Elementary Meditation > Chapter 1 : Preparatory > # 500