“Those who are guilty of the argumentum ad ignorantiam profess belief in something because its opposite cannot be proved … In the realm where “prejudice” is now most an issue, it normally takes a form like this: you cannot prove—by the method of statistics and quantitative measurement—that men are not equal. Therefore all men are equal. … You cannot prove—again by the methods of science—that one culture is higher than another. Therefore the culture of the Digger Indians is just a good as that of Muncie, Indiana, or thirteenth-century France.”
“Life without prejudice,” p. 6.
Life Without Prejudice (1965)
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Richard M. Weaver 110
American scholar 1910–1963Related quotes

Religion and Science (1935), Ch. IX: Science of Ethics.
1930s
Variant: "What science cannot tell us, mankind cannot know." (Attributed to Russell in Ted Peters' Cosmos As Creation: Theology and Science in Consonance [1989], p. 14, with a note that it was "told [to] a BBC audience [earlier this century]").

Letter to former Illinois Attorney General Usher F. Linder (20 February 1848)
1840s

Source: 1850s, A treatise on differential equations (1859), p. vi; cited in: Quotations by George Boole http://www-history.mcs.st-and.ac.uk/Quotations/Boole.html, MacTutor History of Mathematics, August 2010.

"Proof of God"
1940s, Am I An Atheist Or An Agnostic? http://www.positiveatheism.org/hist/russell8.htm (1947)