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The vocal chanting of a mantram belongs to the elementary practice of it. In the more advanced practice, nothing is spoken aloud and the mantram is simply held in the mind--constantly repeating itself as a thought but a thought to which we kind of listen and from which we seem to stand apart so that it has its own inner vitality. This makes a great difference from the spoken practice, because the latter keeps the mantram fixed whereas the former leaves it flexible.
-- Notebooks Category 4: Elementary Meditation > Chapter 6 : Mantrams, Affirmations > # 39