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“I hear you say: ‘All that is not /fact/ : it is poetryâ€�. Nonsense! Bad poetry is false, I grant; but nothing is truer than true poetry. And let me tell the scientific men that the artists are much finer and more accurate observers than they are, except of the special minutiae that the scientific man is looking for.”
― Charles Sanders Peirce

“{Before the time of Benjamin Peirce it never occurred to anyone that mathematical research} was one of the things for which a mathematical department existed. Today it is a commonplace in all the leading universities. Peirce stood alone—a mountain peak whose absolute height might be hard to measure, but which towered above all the surrounding country.”
― Julian Lowell Coolidge

“The appearance of Professor Benjamin Peirce, whose long gray hair, straggling grizzled beard and unusually bright eyes sparkling under a soft felt hat, as he walked briskly but rather ungracefully across the college yard, fitted very well with the opinion current among us that we were looking upon a real live genius, who had a touch of the prophet in his make-up.”
― William Elwood Byerly

“[Benjamin Peirce's] lectures were not easy to follow. They were never carefully prepared. The work with which he rapidly covered the blackboard was very illegible, marred with frequent erasures, and not infrequent mistakes (he worked too fast for accuracy). He was always ready to digress from the straight path and explore some sidetrack that had suddenly attracted his attention, but which was likely to have led nowhere when the college bell announced the close of the hour and we filed out, leaving him abstractedly staring at his work, still with chalk and eraser in his hands, entirely oblivious of his departing class.”
― William Elwood Byerly

“Charles Peirce wrote the definition of University in the Century Dictionary. He called it an institution for purposes of study. They wrote to him that their notion had been that a university was an institution for instruction. He wrote back that if they had any such notion they were grievously mistaken, that a university had not and never had had anything to do with instruction and that until we got over this idea we should not have any university in this country.”
― Max Harold Fisch, Peirce, Semeiotic and Pragmatism: Essays by Max H. Fisch

“When an ostrich buries its head in the sand as danger approaches, it very likely takes the happiest course. It hides the danger, and then calmly says there is no danger; and if it feels perfectly sure there is none, why should it raise its head to see?”
― Peirce

“If we are looking for alternative visions of American life in the decades following the Civil War, Homes, James, Peirce, and Dewey are not the figures we would turn to.  This has something to do, no doubt with their temperaments and their politics, but it is also a consequence of their attitude toward ideas.
What was that attitude?  If we strain out the difference, personal and philosophical, they had with one another, we can say that what these four thinkers had in common was not a group of ideas, but a single idea -- an idea about ideas.  They all believed that ideas are not "out there" waiting to be discovered, but are tools -- like forks and knives and microchips -- that people devise to cope with the world in which they find themselves.  They believed that ideas are produced not by individuals, but by groups of individuals -- that ideas are social.  They believed that ideas do not develop according to some inner logic of their own, but are entirely dependent, like germs, on their human carriers and the environment.  And they believed that since ideas are provisional responses to particular and unreproducible circumstances, their survival depends not on their immutability but on their adaptability.”
― Louis Menand, The Metaphysical Club : A Story of Ideas in America