James Van Allen (1914–2006) American nuclear physicist
Comments to an undergraduate physics class about transformers, Reach Into Space http://www.time.com/time/magazine/article/0,9171,892531,00.html, Time, 1959-05-04.
“If you refuse to take account of theory, then you have forgotten that practice is often an offspring of theory.”
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Fausto Cercignani65
Italian scholar, essayist and poet 1941Related quotes
“Paradoxes often arise because theory routinely refuses to be subordinate to reality.”
L. K. Samuels (1951) American writer
Source: In Defense of Chaos: The Chaology of Politics, Economics and Human Action, (2013), p. 324
“Laws which are consistent in theory often prove chaotic in practice.”
Napoleon I of France (1769–1821) French general, First Consul and later Emperor of the French
Napoleon : In His Own Words (1916)
“In theory there is no difference between theory and practice; in practice there is.”
Yogi Berra (1925–2015) American baseball player, manager, coach
Attributed in Nassim Nicholas Taleb, Antifragile - Things that Gain From Disorder (2012), p. 213.
The earliest known appearance of this quote in print is Walter J. Savitch, Pascal: An Introduction to the Art and Science of Programming (1984), where it is attributed as a "remark overheard at a computer science conference". It circulated as an anonymous saying for more than ten years before attributions to Jan L. A. van de Snepscheut and Yogi Berra began to appear (and later still to various others).
Disputed, Misattributed
“In theory, there is no difference between theory and practice. But, in practice, there is.”
Jan L. A. van de Snepscheut (1953–1994) Dutch computer scientist
The earliest known appearance in print of this quote is Benjamin Brewster in the October 1881 - June 1882 issue of "The Yale Literary Magazine." Brewster asks, "What does his lucid explanation amount to but this, that in theory there is no difference between theory and practice, while in practice there is?" See page 202. https://books.google.com/books?id=iJ9MAAAAMAAJ&printsec=frontcover&vq=%22no+difference%22#v=onepage&q&f=false It has also been attributed by Doug Rosenberg and Matt Stephens (2007) Use Case Driven Object Modeling with UMLTheory and Practice p. xxvii as well as Walter J. Savitch, Pascal: An Introduction to the Art and Science of Programming (1984), where it is attributed as a "remark overheard at a computer science conference". It circulated as an anonymous saying for more than ten years before attributions to van de Snepscheut and Yogi Berra began to appear (and later still to various others).
Misattributed
Karl Popper (1902–1994) Austrian-British philosopher of science
Objective Knowledge: An Evolutionary Approach (1972)
Aron Ra (1962) Aron Ra is an atheist activist and the host of the Ra-Men Podcast
Youtube, Other, Reason Rally Ra Rant https://www.youtube.com/watch?v=isrST6wOUJA (March 28, 2012)
Thomas Robert Malthus Principles of Political Economy
Book I, Introduction, p. 8
Principles of Political Economy (Second Edition 1836)
Paulo Freire (1921–1997) educator and philosopher
Source: Pedagogia do oprimido (Pedagogy of the Oppressed) (1968, English trans. 1970), Chapter 2
Benito Mussolini (1883–1945) Duce and President of the Council of Ministers of Italy. Leader of the National Fascist Party and subsequen…
to Edwin L. James of the New York Times (1928)
1920s