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The materialist who tries to find a physical explanation for every sickness is nevertheless forced to admit that the mind does have at the very least a limited influence upon the body. This is proven by mental shock hastening the heartbeat; by worry acting on the nervous system and affecting the flow of secretions, thus contributing towards indigestion; by violent anger raising the blood pressure. Because fear liberates toxic poisons, the expression "died of fright" may be literally true.
-- Notebooks Category 10: Healing of the Self > Chapter 3 : The Origins of Illness > # 75