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That the greater length and higher intensity of a sitting meditation have a purificatory effect is true; that if such profound and prolonged meditations are repeated often enough the trend of thought and feeling, the shape of character, and the quality of consciousness may be reshaped is also true. But the change may not be of a lasting nature if philosophy is absent.
-- Notebooks Category 16: The Sensitives > Chapter 2 : Phases of Mystical Development > # 24