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Naturalism and anti-Cartesianism

From the outset, pragmatists wanted to reform philosophy and bring it more in line with the scientific method as they understood it. They argued that idealist and realist philosophy had a tendency to present human knowledge as something beyond what science could grasp. They held that these philosophies then resorted either to a phenomenology inspired by Kant or to correspondence theories of knowledge and truth. Pragmatists criticized the former for its a priorism, and the latter because it takes correspondence as an unanalyzable fact. Pragmatism instead tries to explain the relation between knower and known.

In 1868, C.S. Peirce argued that there is no power of intuition in the sense of a cognition unconditioned by inference, and no power of introspection, intuitive or otherwise, and that awareness of an internal world is by hypothetical inference from external facts. Introspection and intuition were staple philosophical tools at least since Descartes. He argued that there is no absolutely first cognition in a cognitive process; such a process has its beginning but can always be analyzed into finer cognitive stages. That which we call introspection does not give privileged access to knowledge about the mind—the self is a concept that is derived from our interaction with the external world and not the other way around. At the same time he held persistently that pragmatism and epistemology in general could not be derived from principles of psychology understood as a special science: what we do think is too different from what we should think; in his " Illustrations of the Logic of Science " series, Peirce formulated both pragmatism and principles of statistics as aspects of scientific method in general. This is an important point of disagreement with most other pragmatists, who advocate a more thorough naturalism and psychologism.

Richard Rorty expanded on these and other arguments in Philosophy and the Mirror of Nature in which he criticized attempts by many philosophers of science to carve out a space for epistemology that is entirely unrelated to—and sometimes thought of as superior to—the empirical sciences. W.V. Quine, who was instrumental in bringing naturalized epistemology back into favor with his essay "Epistemology Naturalized", also criticized "traditional" epistemology and its "Cartesian dream" of absolute certainty. The dream, he argued, was impossible in practice as well as misguided in theory, because it separates epistemology from scientific inquiry.