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It is better not to dwell on any visual phenomena other than at the moment of occurrence, or else progress will be impeded. What is more important than seeing is the state of feeling produced; this must be pure awareness from which all psychical elements are excluded. Not until this state has been thoroughly established and integrated with active life and intellectual understanding and the moral nature, is it safe to examine or experiment with psychic phenomena.
-- Notebooks Category 4: Elementary Meditation > Chapter 1 : Preparatory > # 503