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If pressed to supplement Tweedledee's ostensive definition of logic with a discursive definition of the same subject, I would say that logic is the systematic study of the logical truths. Pressed further, I would say that a sentence is logically true if all sentences with its grammatical structure are true. Pressed further still, I would say to read this book.
Willard Van Orman Quine -
It is one of the consolations of philosophy that the benefit of showing how to dispense with a concept does not hinge on dispensing with it.
Willard Van Orman Quine
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Life is agid, life is fulgid. Life is what the least of us make most of us feel the least of us make the most of. Life is a burgeoning, a quickening of the dim primordial urge in the murky wastes of time.
Willard Van Orman Quine -
We do not learn first what to talk about and then what to say about it.
Willard Van Orman Quine -
The totality of our so-called knowledge or beliefs, from the most casual matters of geography and history to the profoundest laws of atomic physics or even of pure mathematics and logic, is a man-made fabric which impinges on experience only along the edges. Or, to change the figure, total science is like a field of force whose boundary conditions are experience.
Willard Van Orman Quine -
One man's observation is another man's closed book or flight of fancy.
Willard Van Orman Quine -
Logic is an old subject, and since 1879 it has been a great one.
Willard Van Orman Quine -
The lore of our fathers is a fabric of sentences. In our hands it develops and changes, through more or less arbitrary and deliberate revisions and additions of our own, more or less directly occasioned by the continuing stimulation of our sense organs. It is a pale gray lore, black with fact and white with convention. But I have found no substantial reasons for concluding that there are any quite black threads in it, or any white ones.
Willard Van Orman Quine
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Nonbeing must in some sense be, otherwise what is it that there is not? This tangled doctrine might be nicknamed Plato's beard; historically it has proved tough, frequently dulling the edge of Occam's razor.
Willard Van Orman Quine -
Physics investigates the essential nature of the world, and biology describes a local bump. Psychology, human psychology, describes a bump on the bump.
Willard Van Orman Quine -
Linguistically, and hence conceptually, the things in sharpest focus are the things that are public enough to be talked of publicly, common and conspicuous enough to be talked of often, and near enough to sense to be quickly identified and learned by name; it is to these that words apply first and foremost.
Willard Van Orman Quine -
Our talk of external things, our very notion of things, is just a conceptual apparatus that helps us to foresee and control the triggerings of our sensory receptors in the light of previous triggering of our sensory receptors.
Willard Van Orman Quine -
Confusion of sign and object is original sin coeval with the word.
Willard Van Orman Quine -
Life is what the least of us make the most of us feel the least of us make the most of.
Willard Van Orman Quine
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To define an expression is, paradoxically speaking, to explain how to get along without it. To define is to eliminate.
Willard Van Orman Quine -
Language is conceived in sin and science is its redemption.
Willard Van Orman Quine -
The strategy of semantic ascent is that it carries the discussion into a domain where both parties are better agreed on the objects (viz., words) and on the main terms connecting them. Words, or their inscriptions, unlike points, miles, classes and the rest, are tangible objects of the size so popular in the marketplace, where men of unlike conceptual schemes communicate at their best. The strategy is one of ascending to a common part of two fundamentally disparate conceptual schemes, the better to discuss the disparate foundations. No wonder it helps in philosophy.
Willard Van Orman Quine -
Unlike Descartes, we own and use our beliefs of the moment, even in the midst of philosophizing, until by what is vaguely called scientific method we change them here and there for the better. Within our own total evolving doctrine, we can judge truth as earnestly and absolutely as can be, subject to correction, but that goes without saying.
Willard Van Orman Quine -
Scientific method is the way to truth, but it affords, even in principle, no unique definition of truth. Any so-called pragmatic definition of truth is doomed to failure equally.
Willard Van Orman Quine -
Necessity resides in the way we talk about things, not in the things we talk about.
Willard Van Orman Quine