Claims that cannot be tested, assertions immune to disproof are veridically worthless, whatever value they may have in inspiring us or in exciting our sense of wonder.
Carl Sagan (1934–1996) American scientist and writer
The Demon-Haunted World, ch. 10 “The Dragon in My Garage” (1995)
(Source)
Quotations about:
disproving
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Many orthodox people speak as though it were the business of sceptics to disprove received dogmas rather than of dogmatists to prove them. This is, of course, a mistake. If I were to suggest that between the Earth and Mars there is a china teapot revolving about the sun in an elliptical orbit, nobody would be able to disprove my assertion provided I were careful to add that the teapot is too small to be revealed even by our most powerful telescopes. But if I were to go on to say that, since my assertion cannot be disproved, it is intolerable presumption on the part of human reason to doubt it, I should rightly be thought to be talking nonsense.
Bertrand Russell (1872–1970) English mathematician and philosopher
“Is There a God?” (1952)
(Source)
Essay commissioned by Illustrated magazine in 1952, but never published there. First publication in Russell, Last Philosophical Testament, 1943-68 (1997) [ed. Slater/Köllner].
I believe this is the earliest (chronologically) reference by Russell to his teapot analogy.
