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When my information changes, I alter my conclusions. What do you do, sir?

John Maynard Keynes (1883-1946) English economist
(Attributed)

Reply to a criticism of having changed his position on monetary policy. Quoted in Paul Samuelson, "The Keynes Centenary" The Economist, Vol. 287 (1983), but possibly apocryphal (see here).
Added on 21-Mar-17 | Last updated 24-Mar-17
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If the first button of one’s coat is wrongly buttoned, all the rest will be crooked.

Giordano Bruno (1548-1600) Italian philosopher
(Attributed)
    (Source)

Attributed in John Emerich & Edward Dalberg, The Cambridge Modern History (1904).
Added on 8-Dec-14 | Last updated 8-Dec-14
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In all affairs it’s a healthy thing now and then to hang a question mark on the things you have long taken for granted.

Bertrand Russell (1872-1970) English mathematician and philosopher
(Attributed)
Added on 1-Feb-04 | Last updated 9-May-16
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Logic is an organized way of going wrong with confidence.

Kettering - ketterings law - wist_info quote

Charles F. Kettering (1876-1958) American inventor, engineer, researcher, businessman
“Kettering’s Law,” from address before American Society of Mechanical Engineers (c. 1944)

Quoted in Heinlein, The Number of the Beast (1980).

Alternately quoted:

  • "Beware logic. Logic is an organized way to go wrong -- with confidence."
  • Logic is an organized way to go wrong with confidence. We should all know by now that a logical course is not always the right one."

Sometimes referred to "Kettering's Observation."

Cited in Food Industries magazine, vol. 16 (1944), referring to the speech being "recent" (the magazine is also referred to as Food Engineering).

This site previously incorrectly attributed the quote to Iris Murdoch.  That attribution seems to have been duplicated at some other sites, but was an error.  I have also found citations to L. Walter Lundell and Karl Popper.

Another "Kettering's Law" that is referenced is: "Parts left out cost nothing, require no maintenance, and do not fail."

Added on 1-Feb-04 | Last updated 7-Dec-15
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