“I wish to propose a doctrine which may, I fear, appear wildly paradoxical and subversive. The doctrine in question is this: that it is undesirable to believe a proposition when there is no ground whatever for supposing it true. I must, of course, admit that if such an opinion became common it would completely transform our social life and our political system; since both are at present faultless, this must weigh against it.”

— Carl Sagan , book Contact

Source: Contact (1985), Chapter 2 (p. 15, quoting Bertrand Russell)

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Carl Sagan 365

American astrophysicist, cosmologist, author and science ed… 1934–1996

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“I wish to propose for the reader's favourable consideration a doctrine which may, I fear, appear wildly paradoxical and subversive. The doctrine in question is this: that it is undesirable to believe a proposition when there is no ground whatever for supposing it true.”

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Source: 1920s, Sceptical Essays (1928), Ch. 1: The Value of Scepticism

“Now first of all I would like to talk about the question of different ideologies and social systems. We have to admit that among our Asian and African countries, we do have different ideologies and different social systems. But this does not prevent us from seeking common ground and being united.”

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James Anthony Froude book The Nemesis of Faith

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“I was anxious two years ago as to the line which our party would take on the Indian question. I believed that the one course was the only one for a progressive party—and a party must be progressive to live. I believed that the other course led to the destruction of the party.”

Stanley Baldwin (1867–1947) Former Prime Minister of the United Kingdom

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“If I would be true to myself, true to my Heavenly Father, I must pursue that course of conduct which, to me, appears best calculated to promote the highest good of the world.”

Lucy Stone (1818–1893) American abolitionist and suffragist

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Context: I know, Mother, you feel badly and that you would prefer to have me take some other course, if I could in conscience. Yet, Mother, I know you too well to suppose that you would wish me to turn away from what I think is my duty. I surely would not be a public speaker if I sought a life of ease, for it will be a most laborious one; nor would I do it for the sake of honor, for I know that I shall be disesteemed, even hated, by some who are now my friends, or who profess to be. Neither would I do it if I sought wealth, because I could secure it with far more ease and worldly honor by being a teacher. If I would be true to myself, true to my Heavenly Father, I must pursue that course of conduct which, to me, appears best calculated to promote the highest good of the world.

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“[Fascism] is not a sign-post which would direct us here, for I firmly believe that our long experienced democracy will be able to preserve a parliamentary system of government with whatever modifications may be necessary from both extremes of arbitrary rule.”

Winston S. Churchill (1874–1965) Prime Minister of the United Kingdom

Speech to the Anti-Socialist and Anti-Communist Union (17 February 1933), quoted in Martin Gilbert, Prophet of Truth: Winston S. Churchill, 1922–1939 (London: Minerva, 1990), p. 457
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Alex Salmond (1954) Scottish National Party politician and former First Minister of Scotland

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Carl Sagan 365

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