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.

More information about this quote

Authentication Score 2

Original Citation

Darwin, Charles. Letter to William Graham. 3 July 1881.

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.