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In God we trust. All others must bring data.

W. Edwards Deming (1900-1993) American management consultant, educator

Variants: "All others must have/provide data."

Frequently attributed to Deming, probably through Mary Walton, The Deming Management Method, ch. 20 (1986), though it is presented there without attribution: "'In God we trust. All others must bring data.' If there is a credo for statisticians, it is that."

The earliest appearance in print comes from Edwin R. Fisher, Effect of Smoking on Nonsmokers: Hearing Before the Subcommittee on Tobacco of the Committee on Agriculture, House of Representatives, Ninety-fifth Congress, Second Session (7 Sep 1978): "I should like to close by citing a well-recognized cliche in scientific circles. The cliche is, 'In God we trust, others must provide data.'"

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Added on 21-Jul-20 | Last updated 21-Jul-20
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To avoid the various foolish opinions to which mankind are prone, no superhuman genius is required. A few simple rules will keep you, not from all error, but from silly error. If the matter is one that can be settled by observation, make the observation yourself. Aristotle could have avoided the mistake of thinking that women have fewer teeth than men, by the simple device of asking Mrs. Aristotle to keep her mouth open while he counted. He did not do so because he thought he knew. Thinking that you know when in fact you don’t is a fatal mistake, to which we are all prone. I believe myself that hedgehogs eat black beetles, because I have been told that they do; but if I were writing a book on the habits of hedgehogs, I should not commit myself until I had seen one enjoying this unappetizing diet.

Bertrand Russell (1872-1970) English mathematician and philosopher
“An Outline of Intellectual Rubbish,” Unpopular Essays (1950)
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I am reminded of the professor who, in his declining hours, was asked by his devoted pupils for his final counsel. He replied, “Verify your quotations.”

Winston Churchill (1874-1965) British statesman and author
The Second World War, Vol. 4: The Hinge of Fate (1951)
Added on 11-Oct-10 | Last updated 23-May-20
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