New Thought, Mind-healing movement that originated in the U.S. in the 19th century. Its earliest proponent, Phineas P. Quimby (1802–66), was a mesmerist who taught that illness is mental. New Thought was influenced by philosophers ranging from Plato to Emanuel Swedenborg, Georg Wilhelm Friedrich Hegel, and Ralph Waldo Emerson and in turn influenced Mary Baker Eddy’s Christian Science. The International New Thought Alliance (formed 1914) asserts that sin and illness stem from incorrect thinking. New Thought groups emphasize Jesus as a teacher and healer and proclaim his kingdom as being within each person.
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