“It is terrible to see how a single unclear idea, a single formula without meaning, lurking in a young man’s head, will sometimes act like an obstruction … in an artery, hindering the nutrition of the brain, and condemning its victim to pine away in the fullness of his intellectual vigor and in the midst of intellectual plenty.”

— Charles Sanders Peirce

"How to make our ideas clear,” Popular Science Monthly, Vol. 12 (January 1878)

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Charles Sanders Peirce 121

American philosopher, logician, mathematician, and scientist 1839–1914

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