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.... It must be something which affects, or might affect, every man. And though these affections are necessarily as various as are individual conditions, yet the method must be such that the ultimate conclusion of every man shall be the same, or would be the same if inquiry were persisted in. Such is the method of science.
Charles Sanders Peirce (1839–1914), U.S. philosopher, logician, founder of pragmatism. Originally published in Popular Science Monthly. "How to Make Our Ideas Clear," pp. 61-78, Pragmatism: The Classical Writings, ed. H.S. Thayer (1878).
Expressing why the scientific method is to be preferred over the methods of authority, tenacity and the a priori.