W.V.O. Quine: Philosophy, Quotes & Legacy

Biography

Willard Van Orman Quine was born on June 25, 1908, in Akron, Ohio, the son of Cloyd Robert Quine, an industrial engineer and entrepreneur, and Harriet Ellis Van Orman, a schoolteacher. The Quine household valued practical ingenuity and intellectual curiosity in equal measure, and young Willard — known to friends and family throughout his life as Van — absorbed both qualities. He showed an early aptitude for mathematics and an equally early fascination with language, cartography, and the internal workings of systems of all kinds. As a teenager, he compiled a private atlas of imaginary countries, complete with histories, languages, and economic systems, an exercise that foreshadowed his lifelong interest in the relationship between symbolic systems and the world they represent. He attended Oberlin College, where he majored in mathematics with honors, but his interests were already expanding beyond the strictly mathematical. He read Bertrand Russell's Introduction to Mathematical Philosophy and Alfred North Whitehead and Russell's Principia Mathematica with a sense of revelation, and he decided that the philosophy of logic and mathematics was where his deepest interests lay.

Quine entered Harvard University as a graduate student in 1930, and he would remain affiliated with Harvard for the next seventy years — as a student, a faculty member, and an emeritus professor. His doctoral dissertation, completed in 1932 under the supervision of Alfred North Whitehead, dealt with the logic of the Principia Mathematica. Whitehead, whose own philosophical range was extraordinarily broad, encouraged Quine's ambition and gave him the freedom to pursue his increasingly independent line of thought. Quine's dissertation was awarded the Sheldon Traveling Fellowship, which funded a year of study in Europe from 1932 to 1933. This European sojourn was decisive. Quine traveled to Vienna, Prague, and Warsaw, where he met the leading figures of the logical empiricist movement: Rudolf Carnap, Moritz Schlick, Otto Neurath, and the other members of the Vienna Circle. He also met Alfred Tarski in Warsaw, whose work on the semantic conception of truth would profoundly influence Quine's thinking about language and ontology. Of all these encounters, the most important was with Carnap. Quine later described Carnap as his "greatest teacher," and the years of intensive engagement with Carnap's logical syntax program and his approach to the philosophy of science shaped Quine's entire philosophical outlook. But Quine was never an orthodox disciple of logical positivism. Even as he absorbed its methods and commitments, he was already developing the criticisms that would, in time, make him one of its most effective internal critics.

Quine returned to Harvard in 1933 as a three-year member of the Society of Fellows, a position that gave him the freedom to develop his ideas without the immediate pressure of teaching or publication. In 1936, he was appointed to the Harvard faculty as an instructor, and he rose steadily through the ranks: assistant professor in 1941, associate professor in 1945, full professor in 1948, and Edgar Pierce Professor of Philosophy in 1956. During World War II, Quine served in the United States Navy as a lieutenant commander, working in naval intelligence on code-breaking and cryptographic projects — work that drew on his logical training and that he carried out with characteristic precision and efficiency. After the war, he returned to Harvard and began the most productive period of his career.

Quine's influence as a teacher was as significant as his influence through his publications. Over four decades at Harvard, he trained a generation of philosophers who would come to dominate American analytic philosophy. Among his students were Daniel Dennett, who absorbed Quine's naturalism and his insistence that philosophy should be continuous with empirical science; Hilary Putnam, who studied with Quine at Harvard before transferring to UCLA; David Lewis, whose systematic metaphysics was shaped by Quine's approach to ontological commitment; and Burton Dreben, who became one of the leading historians of analytic philosophy. Quine's influence extended far beyond his immediate students, however. His books — especially From a Logical Point of View (1953), Word and Object (1960), and Ontological Relativity and Other Essays (1969) — were read by virtually every analytic philosopher of his generation, and his views on ontology, epistemology, and the philosophy of language set the terms of debate for decades. Quine died on December 25, 2000, in Boston, Massachusetts, at the age of ninety-two, having outlived most of the movement he helped to create and transform.

Philosophy

Quine's philosophy is animated by a single, powerful vision: that philosophy is not a separate, a priori discipline standing above or alongside the natural sciences, but is itself a part of the scientific enterprise, continuous with empirical inquiry and subject to the same standards of evidence and explanation. This naturalistic vision, which Quine inherited in part from the American pragmatist tradition and in part from the logical empiricism of the Vienna Circle, led him to challenge some of the most fundamental assumptions of twentieth-century philosophy — the analytic-synthetic distinction, the reduction of theoretical statements to observation statements, the idea that philosophy has a distinctive method or subject matter — and to replace them with a holistic, naturalized picture of human knowledge. The Stanford Encyclopedia of Philosophy describes Quine as the most influential American philosopher of the second half of the twentieth century, a judgment that reflects both the depth of his positive contributions and the transformative effect of his criticisms.

Two Dogmas of Empiricism

Quine's most famous and consequential paper, "Two Dogmas of Empiricism," was published in The Philosophical Review in 1951 and reprinted as the opening essay of From a Logical Point of View (1953). The paper attacks two pillars of logical empiricism: the distinction between analytic and synthetic statements, and the reductionist assumption that each meaningful statement is equivalent to a logical construction out of immediate experience. These two dogmas, Quine argued, are not independent but deeply connected — both rest on the same illusory notion that individual statements can be confirmed or disconfirmed in isolation.

The analytic-synthetic distinction, as Quine understood it, separates statements that are true by virtue of meaning alone ("all bachelors are unmarried") from statements that are true by virtue of fact ("there are nine planets in the solar system"). The logical empiricists treated this distinction as fundamental: analytic truths are the province of logic and mathematics, synthetic truths are the province of empirical science, and the philosopher's task is to analyze the logical structure of language rather than to discover empirical facts. Quine argued that this distinction cannot be maintained. Attempts to define analyticity in terms of synonymy, and synonymy in terms of interchangeability or definition, all run in circles — they presuppose the very notion they are supposed to explain. The only non-circular account of analyticity would require a notion of "cognitive meaning" that attaches to individual statements, and this, Quine argued, is precisely what the second dogma — reductionism — provides and what he was about to demolish.

The second dogma is the belief that "each meaningful statement is equivalent to some logical construct upon terms which refer to immediate experience." This is the reductionist assumption that every statement can, in principle, be translated into a statement about sensory experience — that the meaning of "this table is brown" can be analyzed into a set of observation statements about color patches and tactile sensations. Quine argued that this reduction is impossible because our statements about the external world face the tribunal of sensory evidence not individually but as a corporate body. No single statement is conclusively verified or refuted by any particular observation, because any statement can be preserved or abandoned by making compensating adjustments elsewhere in the system. If a prediction based on my theory fails, I can revise the theory, or I can question the observation, or I can adjust background assumptions about the reliability of my instruments. There is no principled way to determine which statement is "responsible" for the failure.

The Web of Belief and Confirmation Holism

This leads to Quine's most influential positive thesis: confirmation holism. Our beliefs, Quine argued, form an interconnected web, and it is the web as a whole — not individual statements within it — that confronts the tribunal of experience. At the periphery of the web are observation statements, directly tied to sensory stimulation. At the center are the principles of logic and mathematics, which are most insulated from revision. When experience conflicts with our beliefs, we must make adjustments somewhere in the web, but the choice of where to make them is underdetermined by experience and is governed instead by pragmatic considerations: we prefer the revisions that minimize disruption to the overall system, that preserve simplicity and explanatory power, and that cohere with our other beliefs. This means that even the principles of logic and mathematics are, in principle, revisable — they are not insulated from empirical correction by virtue of being "analytic," because there is no analytic-synthetic distinction to insulate them.

The web of belief has profound implications. It means that the truths of logic and mathematics, which the tradition had treated as necessary and a priori, are in fact as revisable as any other part of our belief system, though they are much more resistant to revision because of their central position in the web. It means that the distinction between empirical content and conventional stipulation is a matter of degree, not kind: statements at the periphery are heavily constrained by experience, while statements at the center are lightly constrained, but no statement is entirely free of empirical import or entirely determined by it. And it means that epistemology — the theory of knowledge — cannot proceed by analyzing the logical structure of individual belief-forming processes but must instead study the entire system of beliefs and its adjustment to experience. This holistic picture, which Quine developed throughout the 1950s and 1960s, became the default framework for much of subsequent analytic epistemology.

The Indeterminacy of Translation

In Word and Object (1960), Quine extended his holistic and naturalistic approach to language with the thesis of the indeterminacy of translation. The thesis, which is among the most controversial in twentieth-century philosophy of language, states that there is no fact of the matter about what a speaker means by a given utterance — that multiple, incompatible translation manuals can each be fully consistent with all the behavioral evidence, and that there is no further fact, beyond the behavioral evidence, that could determine which manual is correct.

Quine introduced the thesis through the thought experiment of "radical translation," in which a linguist attempts to translate the language of a previously unknown people from scratch, with no prior knowledge of their language or culture. The linguist observes the speakers' behavior — their utterances, their responses to stimuli, their patterns of assent and dissent — and constructs a translation manual that maps their utterances onto English sentences. Quine argued that the behavioral evidence will always underdetermine the translation: there will always be multiple manuals that fit the evidence equally well but that assign different meanings to the speakers' utterances. A word that the linguist translates as "rabbit" might equally well be translated as "undetached rabbit part" or "rabbit stage" — all three translations are consistent with the behavioral evidence, and there is no further fact about the speakers' mental states that could settle the question, because meaning, for Quine, is a matter of behavioral disposition, not inner mental reality.

The indeterminacy of translation is not the trivial claim that translation is difficult or that some ambiguity cannot be resolved. It is the radical claim that there is no determinate fact about what a speaker means, even in principle. This follows directly from Quine's rejection of the analytic-synthetic distinction and his confirmation holism: if there is no sharp boundary between statements that are true by virtue of meaning and statements that are true by virtue of fact, then the notion of "meaning" itself becomes suspect, and the question of what a speaker means by a word cannot be settled by an appeal to meanings that are somehow attached to the word independently of its use.

Naturalized Epistemology

In the title essay of Ontological Relativity and Other Essays (1969), Quine took his naturalism to its logical conclusion with the proposal for "naturalized epistemology." Traditional epistemology, from Descartes through Hume and Kant, sought to provide a philosophical foundation for empirical knowledge — to show, by a priori reasoning, that our beliefs about the external world are justified. Quine argued that this foundationalist project has failed. The attempt to reduce physical objects to sense data, or to find a class of "protocol sentences" that are incorrigible and can serve as the foundation for the rest of knowledge, has not succeeded, and the holistic picture of the web of belief shows why: no statement is immune to revision, and there is no privileged class of foundational beliefs.

Quine's response was not to abandon epistemology but to naturalize it. Epistemology, he argued, should become a chapter of empirical psychology. Instead of asking, from a philosophical standpoint, how we can know about the external world, we should ask, as scientists, how we do come to have the beliefs we have — how the input of sensory stimulation produces the output of theory about the world. This is a scientific question, to be answered by investigation into the mechanisms of perception, learning, and cognition, not a philosophical question to be answered by a priori analysis. The philosopher's contribution is not to provide a foundation for science but to clarify the logical structure of scientific theory and to study, from within science, how science itself is possible.

Ontological Commitment

Quine's approach to ontology is summed up in his famous dictum, "to be is to be the value of a variable." This means that the question of what exists — what entities our theory commits us to — is answered not by introspection or metaphysical intuition but by examining the variables of our best scientific theory. If our theory quantifies over numbers (if it contains statements like "for every number n, there exists a number n+1"), then we are committed to the existence of numbers. If it quantifies over physical objects, we are committed to physical objects. The criterion of ontological commitment is elegant in its simplicity: we are committed to the existence of those entities over which our best theories must quantify in order to be true. This is a quote on ontology that has become a touchstone of analytic metaphysics.

Key Ideas

Ontological Relativity

Quine argued that ontology is relative to a background language or conceptual scheme. The question "what exists?" has no absolute answer; it always takes the form "what exists according to this theory?" This is not relativism — Quine insisted that some theories are better than others, more simple, more explanatory, more consistent with the evidence — but it means that ontological questions cannot be answered independently of the linguistic framework in which they are posed. We cannot ask whether numbers "really" exist, independently of any theory; we can only ask whether our best theory of the world needs to quantify over numbers, and if so, what kind of entities numbers are within that theory.

No Entity Without Identity

Quine's other famous ontological slogan, "no entity without identity," expresses the principle that we should not admit entities into our ontology unless we can provide identity conditions for them — a criterion for when two putative entities are the same and when they are different. This principle has been enormously influential in analytic metaphysics, where it has been used to challenge the existence of propositions, possible worlds, meanings, and other abstract entities whose identity conditions are difficult to specify. It connects ontology to logic: to count something as an entity is to be able to quantify over it, and to quantify over it is to be able to state when two instances are identical.

Famous Quotes

Quine wrote with a clarity and epigrammatic force that made his formulations memorable:

"To be is to be the value of a variable."

This is Quine's criterion of ontological commitment, first articulated in "On What There Is" (1948). It captures the idea that existence is a matter of quantification: we are ontologically committed to those entities over which our theories must quantify.

"The unit of empirical significance is the whole of science."

From "Two Dogmas of Empiricism," this statement encapsulates confirmation holism. It means that no single statement is confirmed or disconfirmed in isolation; the entire web of belief faces the tribunal of experience as a whole.

"No entity without identity."

This principle, which Quine articulated throughout his career, expresses the requirement that any legitimate ontological category must come with clear identity conditions. It has become a foundational principle of analytic metaphysics.

Legacy

W.V.O. Quine's legacy is writ large across the landscape of twentieth-century analytic philosophy. The Stanford Encyclopedia of Philosophy describes him as the dominant figure in American philosophy from the 1950s through the 1970s, and his influence extended across the English-speaking philosophical world and beyond. "Two Dogmas of Empiricism" is widely regarded as the most important philosophical paper of the twentieth century; it dismantled the framework of logical empiricism from within and opened up new territory for holistic, naturalistic approaches to knowledge and language. Word and Object set the agenda for the philosophy of language for decades, and the indeterminacy of translation remains a central topic of debate. Naturalized epistemology transformed the relationship between philosophy and psychology, helping to launch the interdisciplinary field of cognitive science.

Quine's students and intellectual descendants have carried his naturalistic vision into virtually every area of philosophy. Daniel Dennett extended Quine's naturalism to the philosophy of mind, developing a science-based approach to consciousness that would have been unthinkable without Quine's example. Hilary Putnam built on Quine's work in the philosophy of language and mathematics, though he later challenged many of Quine's central commitments. David Lewis, perhaps the most systematic metaphysician of the late twentieth century, accepted Quine's criterion of ontological commitment and used it as the foundation for his own elaborate ontological system. And Saul Kripke, though he challenged Quine on reference and necessity, shared Quine's commitment to rigor and his willingness to follow arguments wherever they lead.

Quine's legacy is also one of controversy. His rejection of the analytic-synthetic distinction was resisted by many philosophers who argued that the distinction, even if difficult to draw sharply, is indispensable for understanding the structure of knowledge. Wittgenstein and the ordinary language philosophers challenged Quine's approach to meaning, arguing that it abstracted away from the actual practices of language use. Saul Kripke's theory of rigid designation overturned the descriptivist picture of reference that Quine had inherited from Frege and Russell, and the causal theory of reference challenged the behaviorist assumptions underlying Quine's indeterminacy thesis. Noam Chomsky argued that Quine's behaviorism was empirically untenable and that the innate structure of the human language faculty provides precisely the kind of determinate meaning that Quine's indeterminacy thesis denies. These criticisms have not diminished Quine's importance; they have, if anything, confirmed it, by demonstrating that his arguments were sufficiently powerful and provocative to set the terms of debate for an entire generation. The Stanford Encyclopedia of Philosophy notes that whether one agrees with Quine or not, one cannot do analytic philosophy today without engaging with his arguments, and that is the mark of a philosopher whose work has become part of the permanent foundation of the discipline.