With me the horrid doubt always arises whether the convictions of man's mind, which has been developed from the mind of the lower animals, are of any value or at all trustworthy.
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Original Citation
Darwin, Charles. Letter to William Graham. 3 July 1881.
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Current Citation
Darwin, Charles. "To William Graham, 3 July 1881." The Correspondence of Charles Darwin, edited by Frederick Burkhardt and James A. Secord. Vol. 29: 1870. Cambridge University Press, 2022, no. 13230.
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