Extraordinary Claims Require Extraordinary Evidence

Carl Sagan? Marcello Truzzi? Pierre-Simon Laplace? David Hume? Benjamin Bayly? Elihu Palmer? William Craig Brownlee? F. B. Barton? William Denton? Ely Vaughan Zollars? Joseph Rinn? James Oberg? Arthur C. Clarke?

Dear Quote Investigator: Tabloid newspapers have printed remarkable claims about alien abductions, mischievous ghosts, bigfoot sightings, and other anomalies. Skeptics have countered these reports by stating that the evidence is inadequate. Here are two versions of a pertinent adage:

Extraordinary claims require extraordinary evidence.
Extraordinary claims require extraordinary proof.

This saying has been attributed to astronomer Carl Sagan, sociologist Marcello Truzzi, and mathematician Pierre-Simon Laplace. Would you please explore this topic?

Quote Investigator: These sayings form a natural family although the vocabulary and phrasing varies. The following overview with dates shows the evolution:

1708: These matters being very extraordinary, will require a very extraordinary proof (Benjamin Bayly)

1738: As it is a matter of an extraordinary kind, it is but reasonable in us to require extraordinary evidence for it

1740: Every man has a right to demand extraordinary evidence for any extraordinary fact (Arthur Ashley Sykes)

1741: Assertions so contrary to fact … require some extraordinary proof to gain our credit and assent (John Straight)

1748: A wise man, therefore, proportions his belief to the evidence (David Hume)

1748: No testimony is sufficient to establish a miracle, unless the testimony be of such a kind, that its falsehood would be more miraculous, than the fact, which it endeavours to establish (David Hume)

1800: Miracles being very unusual and extraordinary facts, they require very strong evidence to support them (Beilby Porteus)

1804: I ought to have extraordinary evidence, to induce me to believe extraordinary things (Elihu Palmer)

1810: Plus un fait est extraordinaire, plus il a besoin d’être appuyé de fortes preuves (Pierre-Simon Laplace)

1810: The more extraordinary a fact, the more it needs to be supported by strong proofs (Translation of Pierre-Simon Laplace)

1824: Extraordinary claims can rest only on extraordinary proofs (William Craig Brownlee)

1826: For extraordinary facts, we should have extraordinary evidence

1852: Extraordinary claims should be backed by extraordinary proof

1854: An extraordinary, an unnatural event, demands extraordinary evidence (F. B. Barton)

1871: Extraordinary evidence is needed to establish extraordinary facts (William Denton)

1895: Extraordinary claims always call for extraordinary proof (Ely Vaughn Zollars)

1906: Wonderful phenomena need wonderful evidence in their support (Joseph F. Rinn)

1975: Extraordinary claims require extraordinary proof (Marcello Truzzi)

1976: Extraordinary proof is necessary for extraordinary claims (Kendrick Frazier credited Marcello Truzzi)

1977: Extraordinary claims require extraordinary evidence (Carl Sagan)

1979: Extraordinary claims demand extraordinary proof. (James Oberg)

Below are selected citations in chronological order.

Continue reading Extraordinary Claims Require Extraordinary Evidence

Do Not Be So Open-Minded That Your Brains Fall Out

Carl Sagan? Arthur Hays Sulzberger? Marianne Moore? E. E Cummings? William Allan Neilson? Walter Kotschnig? Samuel Butler? G. K. Chesterton? Max Radin? James Oberg? Anonymous?

Dear Quote Investigator: There is a desirable balance between exploring novel ideas with an open mind and maintaining a healthy skepticism. The following humorous cautionary statement exemplifies the tension:

Do not be so open-minded that your brains fall out.

I have heard this expression attributed to New York Times publisher Arthur Hays Sulzberger, Smith College President William Allan Neilson, and astronomer Carl Sagan. Do you know who should be credited?

Quote Investigator: The earliest published close match located by QI appeared in a newspaper report in January 1940 about a speech by Walter Kotschnig given at Mount Holyoke College in Massachusetts. Kotschnig worked with refugee organizations early in his career and subsequently joined the United States State Department. Boldface has been added:[1] 1940 January 27, Blytheville Courier News, Professor Tells Students to Open Minds to Truth, Quote Page 2, Column 2 and 3, Blytheville, Arkansas. (NewspaperArchive)[2] 1940 February 1, The Canton Repository (Repository), “Open Mind to Truth, Holyoke Class Told” Quote Page 12, Column 8, Canton, Ohio. (GenealogyBank)

Prof. Walter Kotschnig told Holyoke College students to keep their minds open—“but not so open that your brains fall out.”

He condemned the purpose of students who go to college merely to learn skill and urged his listeners to find the “real aim of education, to acquire a philosophy of life, intellectual honesty, and a constant search for truth.”

QI has also located an article published in February 1940 describing a speech delivered by Kotschnig in November 1939. This citation had the second earliest publication date for a close match; however, the date of the speech was the earliest. Details are given further below.

The same metaphor was used in 1937; however, the phrasing was condemnatory instead of cautionary. Details for this citation are given further below. The comical notion that an open mind might lead to a mind with “nothing in it at all” was suggested much earlier in 1886.

Here are additional selected citations in chronological order.

Continue reading Do Not Be So Open-Minded That Your Brains Fall Out

References

References
1 1940 January 27, Blytheville Courier News, Professor Tells Students to Open Minds to Truth, Quote Page 2, Column 2 and 3, Blytheville, Arkansas. (NewspaperArchive)
2 1940 February 1, The Canton Repository (Repository), “Open Mind to Truth, Holyoke Class Told” Quote Page 12, Column 8, Canton, Ohio. (GenealogyBank)