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As he penetrates deeper and deeper into that subtle world of his inner being, he finds that thought, feeling, and even speech affect its condition as powerfully as outer conditions affect his physical being. A complete falsehood or a gross exaggeration, when conscious and deliberate, stuns or inflames the delicate psyche. If persisted in and made habitual, the psyche becomes diseased and falls sick. This may be followed, soon or late according to the sensitivity of the man, by physical sickness. If sickness does not come, then he will be exposed to it in the form of a karma shadowing some future incarnation.
-- Notebooks Category 10: Healing of the Self > Chapter 3 : The Origins of Illness > # 3