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Quotation from Illustrations of the Logic of Science by Charles Sanders Peirce
“To satisfy our doubts, therefore, it is necessary that a method should be found by which our beliefs may be caused by nothing human, but by some external permanency—by something upon which our thinking has no effect.”
Illustrations of the Logic of Science, The Fixation of Belief, V (Chance, Love, and Logic (1923), Project Gutenberg text)

The introduction of the method of science, after tenacity, authority and the a priori method have been found wanting.
Citation: "To satisfy our doubts, therefore, it is necessary that a method should be found by which our beliefs may be caused by nothing human, but by some external permanency—by something upon which our thinking has no effect." — Charles Sanders Peirce, Illustrations of the Logic of Science, The Fixation of Belief, V (Chance, Love, and Logic (1923), Project Gutenberg text). (id peirce-illustrations-of-the-logic-of-science-q3)
Portrait: Charles Sanders Peirce, Napoleon Sarony, Public domain.
