“Opinions derived from long experience are exceedingly valuable”

— Peter Barlow (mathematician)

Context: Opinions derived from long experience are exceedingly valuable, and outweigh all others, while they are consistent with facts and with each other; but they are worse than useless when they lead, as in this instance, to directly opposite opinions.

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Peter Barlow (mathematician) 2

British mathematician and physicist 1776–1862

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“Opinions derived from long experience are exceedingly valuable, and outweigh all others, while they are consistent with facts and with each other; but they are worse than useless when they lead, as in this instance, to directly opposite opinions.”

Peter Barlow (mathematician) (1776–1862) British mathematician and physicist

[Peter Barlow, Second report addressed to the directors and proprietors of the London and Birmingham Railway company, founded on an inspection of, and experiments made on the Liverpool and Manchester railway, B. Fellowes, 1835, 4]

“In my experience, it is perfectly possible to have opinions and also produce valuable, fact-based information for the world.”

Katherine Maher (1983) chief executive officer and executive director of the Wikimedia Foundation

Source: Twitter https://twitter.com/krmaher/status/1353456809424547840, (24 January 2021)

“[P]erhaps one of the most valuable results to be derived from a truly intellectual study of Astronomy is, the habit of keeping up a sustained attention to all the successive steps of a long series of reasonings. Power, and with it dignity, are gained to the mind by this noble exercise.”

George Biddell Airy (1801–1892) English mathematician and astronomer

Introduction
Popular Astronomy: A Series of Lectures Delivered at Ipswich (1868)

“My opinion of my whole experience varies from time to time.”

H.P. Lovecraft book The Transition of Juan Romero

"The Transition of Juan Romero" - Written 16 Sep 1919; first published in Marginalia (1944)
Fiction
Context: My opinion of my whole experience varies from time to time. In broad daylight, and at most seasons I am apt to think the greater part of it a mere dream; but sometimes in the autumn, about two in the morning when winds and animals howl dismally, there comes from inconceivable depths below a damnable suggestions of rhythmical throbbing … and I feel that the transition of Juan Romero was a terrible one indeed.

“War is sweet to those who have no experience of it,
but the experienced man trembles exceedingly at heart on its approach.”

Pindar (-517–-437 BC) Ancient Greek poet

γλυκύ δ᾽ἀπείρῳ πόλεμος.
πεπειραμένων δέ τις ταρβεῖ προσιόντα νιν καρδία περισσῶς.
Fragment 110; page 377.
Variant translations: This phrase is the origin of the Latin proverb "Dulce bellum inexpertis" which is sometimes misattributed to Desiderius Erasmus‎.
War is sweet to them that know it not.
War is sweet to those not acquainted with it
War is sweet to those who do not know it.
War is sweet to those that never have experienced it.
War is delightful to those who have had no experience of it.

“Man, fearfully and wonderfully made, is the workmanship of his all perfect Creator: A State; useful and valuable as the contrivance is, is the inferior contrivance of man; and from his native dignity derives all its acquired importance.”

James Wilson (1742–1798) one of the Founding Fathers of the United States and a signer of the United States Declaration of Independe…

Chisholm v. Georgia, 2 U.S. (2 Dallas) 419 (1793), at 455.

“We should not look back unless it is to derive useful lessons from past errors, and for the purpose of profiting by dearly bought experience.”

George Washington (1732–1799) first President of the United States

“Just as the defending force has gathered valuable experience from…Dieppe, so has the assaulting force…He will not do it like this a second time.”

Gerd von Rundstedt (1875–1953) German Field Marshal during World War II

August 1942. Quoted in "Dieppe 1942: The Jubilee Disaster" - Page 263 - by Ronald Atkin - History - 1980

“From the fame opinion of a soul distinct from the body came the practice of praying, first for the dead, and then to them with a long train of other absurd opinions, and superstitious practices.”

Joseph Priestley book An History of the Corruptions of Christianity

General Conclusions, Part I : Containing Considerations addressed to Unbelievers and especially to Mr. Gibbon
An History of the Corruptions of Christianity (1782)

“The word experiment derives from 'experimentum' - that which has been experienced and what, for the writer, has been experienced is the work of his great predecessors”

Vernon Scannell (1922–2007) British boxer and poet

A Proper Gentleman, 1977

“Opinions derived from long experience are exceedingly valuable”

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Peter Barlow (mathematician) 2

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