„The evil influence of the supposed inconsistency of theory and practice upon speculative science“

"On the Harmony of Theory and Practice in Mechanics" (Jan. 3, 1856)
Kontext: The evil influence of the supposed inconsistency of theory and practice upon speculative science, although much less conspicuous than it was in the ancient and middle ages, is still occasionally to be traced. This it is which opposes the mutual communication of ideas between men of science and men of practice, and which leads scientific men sometimes to employ, on problems that can only be regarded as ingenious mathematical exercises, much time and mental exertion that would be better bestowed on questions having some connection with the arts, and sometimes to state the results of really important investigations on practical subjects in a form too abstruse for ordinary use; so that the benefit which might be derived from their application is for years lost to the public; and valuable practical principles which might have been anticipated by reasoning, are left to be discovered by slow and costly experience.<!--pp. 175

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William John Macquorn Rankine Foto
William John Macquorn Rankine
schottisch-britischer Physiker und Ingenieur 1820 - 1872

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W. H. Auden Foto
George E. P. Box Foto
Jane Roberts Foto

„When we believe that science or religion "has the truth," we stop our speculations. While still referring to the theory of evolution, science accepts it as a fact, about existence, and therefore any speculation that threatens that theory becomes almost heretical.“

—  Jane Roberts American Writer 1929 - 1984

Quelle: The God of Jane: A Psychic Manifesto (1981), p. 58
Kontext: When we believe that science or religion "has the truth," we stop our speculations. While still referring to the theory of evolution, science accepts it as a fact, about existence, and therefore any speculation that threatens that theory becomes almost heretical. So often it seems that there is no other choice in the matter of man's origin than a meaningless universe and an earth populated by creatures who fight for survival, or a universe created by Christianity's objectified God. And to me, at least, the Eastern religions present no acceptable answers, either.

William John Macquorn Rankine Foto
Roger Bacon Foto

„And this [experimental] science verifies all natural and man-made things in particular, and in their appropriate discipline, by the experimental perfection, not by arguments of the still purely speculative sciences, nor through the weak, and imperfect experiences of practical knowledge. And therefore, this is the matron of all preceding sciences, and the final end of all speculation.“

—  Roger Bacon, buch Opus Tertium

Ch 13 ed. J. S. Brewer Opera quadam hactenus inedita (1859) p. 46
Opus Tertium, c. 1267
Original: (la) Et hæc scientia certificat omnia naturalia et artificialia in particulari et in propria disciplina, per experientiam perfectam; non per argumenta, ut scientiæ pure speculativae, nec per debiles et imperfecta experientias ut scientiae operativæ. Et ideo hæc est domina omnium scientiarum præcedentium, et finis totius speculationis.

Karl Marx Foto

„Where speculation ends — in real life — there real, positive science begins: the representation of the practical activity, of the practical process of development of men. Empty talk about consciousness ceases, and real knowledge has to take place.“

—  Karl Marx, buch Die deutsche Ideologie

Vol. I, Part 1, [The Materialist Conception of History].
The German Ideology (1845/46)
Kontext: Where speculation ends — in real life — there real, positive science begins: the representation of the practical activity, of the practical process of development of men. Empty talk about consciousness ceases, and real knowledge has to take place. When reality is depicted, philosophy as an independent branch of activity loses its medium of existence. At the best its place can only be taken by a summing-up of the most general results, abstractions which arise from the observation of the historical development of men. Viewed apart from real history, these abstractions have in themselves no value whatsoever. They can only serve to facilitate the arrangement of historical material, to indicate the sequence of its separate strata. But they by no means afford a recipe or schema, as does philosophy, for neatly trimming the epochs of history. On the contrary, our difficulties begin only when we set about the observation and the arrangement — the real depiction — of our historical material, whether of a past epoch or of the present.

„In theory, there is no difference between theory and practice. But, in practice, there is.“

—  Jan L. A. van de Snepscheut Dutch computer scientist 1953 - 1994

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

Yogi Berra Foto

„In theory there is no difference between theory and practice; in practice there is.“

—  Yogi Berra American baseball player, manager, coach 1925 - 2015

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

Joan Robinson Foto

„But, as soon as speculators become an important influence in the market, their business is to speculate on each others behaviour.“

—  Joan Robinson English economist 1903 - 1983

Quelle: Contributions to Modern Economics (1978), Chapter 5, The Rate of Interest, p. 46

Robert Menzies Foto

„Women are unquestionably destined to exercise more and more influence upon practical politics in Australia“

—  Robert Menzies Australian politician, 12th Prime Minister of Australia 1894 - 1978

Albury Conference, 1944
Wilderness Years (1941-1949)
Kontext: Women are unquestionably destined to exercise more and more influence upon practical politics in Australia…In the educating of the electorate in liberal ideas they have for many years been an effective force. Now we have an organisation in which all distinctions have gone, and with men and women working equally for the one body …

June Downey Foto

„Speculation must wait upon the facts.“

—  June Downey American psychologist 1875 - 1932

August 1909, Popular Science Monthly Volume 75, Article:"The Varificational Factor in Handwriting", p. 153

William John Macquorn Rankine Foto
William John Macquorn Rankine Foto

„Some of the evils which are caused by the fallacy of an incompatibility between theory and practice having been described, it must now be admitted, that at the present time those evils show a decided tendency to decline.“

—  William John Macquorn Rankine civil engineer 1820 - 1872

The extent of intercourse, and of mutual assistance, between men of science and men of practice, the practical knowledge of scientific men, and the scientific knowledge of practical men, have been for some time steadily increasing; and that combination and harmony of theoretical and practical knowledge—that skill in the application of scientific principles to practical purposes, which in former times was confined to a few remarkable individuals, now tends to become more generally diffused.
"On the Harmony of Theory and Practice in Mechanics" (Jan. 3, 1856)

Thomas Hardy Foto
Ervin László Foto

„In the penultimate decade of the twentieth century science is sufficiently advanced to resolve the puzzles that stymied scientists in the last century and demonstrate, without metaphysical speculation, the consistency of evolution in all realms of experience. It is now possible to advance a general evolution theory based on unitary and mutually consistent concepts derived from the empirical sciences.“

—  Ervin László Hungarian musician and philosopher 1932

Quelle: Evolution: the general theory (1996), p. 21 as cited in: Kingsley L. Dennis (2003) An evolutionary paradigm of social systems : An Application of Ervin Laszlo's General. Evolutionary Systems Theory to the Internet http://quigley.mab.ms/wp-content/uploads/2012/01/An-Evolutionary-Paradigm-of-Social-Systems-MA-Thesis.pdf.

George Holmes Howison Foto
Leonardo Da Vinci Foto

„Science is the captain, and practice the soldiers.“

—  Leonardo Da Vinci Italian Renaissance polymath 1452 - 1519

The Notebooks of Leonardo da Vinci (1883), XIX Philosophical Maxims. Morals. Polemics and Speculations.

Paul Krugman Foto

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