Charles Sanders Peirce Quotes
The difference between a pessimistic and an optimistic mind is of such controlling importance in regard to every intellectual function, and especially for the conduct of life, that it is out of the question to admit that both are normal, and the great majority of mankind are naturally optimistic.
Citations
Peirce, Charles Sanders. Collected Papers of Charles Sanders Peirce, Volume 6: Scientific Metaphysics. Edited by Charles Hartshorne and Paul Weiss, Harvard University Press, 1935.
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Charles Sanders Peirce was an American philosopher, logician, mathematician and scientist who is sometimes known as "the father of pragmatism".