William James Quotes
The most immutable barrier in nature is between one man's thoughts and another's.
Citations
James, William. The Principles of Psychology. Vol. 1, Henry Holt and Company, 1890, p. 226.
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William James was an American philosopher, historian, and psychologist, and the first educator to offer a psychology course in the United States. James is considered to be a leading thinker of the late nineteenth century, one of the most influential philosophers of the United States, and the "Father of American psychology".