Charles Sanders Peirce - Bad reasoning as well as good reasoning is

Bad reasoning as well as good reasoning is possible; and this fact is the foundation of the practical side of logic.

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Citations

Peirce, Charles Sanders. Collected Papers of Charles Sanders Peirce, Volume 5: Pragmatism and Pragmaticism. Edited by Charles Hartshorne and Paul Weiss, Harvard University Press, 1934.

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