Famous quotes containing the words evidence and/or efficacy:
“Yet in spite of all they sang in praise of their “Eliza’s reign,” we have evidence that poets may be born and sing in our day, in the presidency of James K. Polk.”
—Henry David Thoreau (1817–1862)
“If there is a case for mental events and mental states, it must be that the positing of them, like the positing of molecules, has some indirect systematic efficacy in the development of theory.”
—Willard Van Orman Quine (b. 1908)