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 (b. 1908), U.S. philosopher, logician. Also appears in somewhat different form as "Logical Truth" in American Philosophers at Work, ed. S. Hook (1956). "Carnap and Logical Truth," pp. 100-125, The Ways of Paradox and Other Essays (1966).
Denying a sharp distinction between the factual and the conventional.