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We have the authority of Indian texts for our assertions. Thus: "Through the mind alone It is to be realized," says Brihadaranyaka Upanishad (IV.4.19). And in Shankara's Commentary on the Gita (II.21) we read, "The mind refined by subjugation of body and senses, and equipped with the teachings of scripture and the teacher, constitutes the sense by which the Self may be seen." Finally, Mundaka Upanishad (III.1.8) says, "When a man's mind has become purified by the serene Light of knowledge, then he sees Him."
-- Notebooks Category 21: Mentalism > Chapter 5 : The Key To the Spiritual World > # 102