„The following Treatise… has been endeavoured to make the theory of limits, or ultimate ratios… the sole foundation of the science, without any aid whatsoever from the theory of series, or algebraical expansions. I am not aware that any work exists in which this has been avowedly attempted, and I have been the more encouraged to make the trial from observing that the objections to the theory of limits have usually been founded either upon the difficulty of the notion itself, or its unalgebraical character, and seldom or never upon anything not to be defined or not to be received in the conception of a limit…“

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Augustus De Morgan Foto
Augustus De Morgan8
1806 - 1871

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Augustus De Morgan Foto
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„A theory of power has long been the Holy Grail for political science, but the Grail has not been found.“

—  Mancur Olson American economist 1932 - 1998

Power and Prosperity: Outgrowing Communist and Capitalist Dictatorships (2000), Ch. 1 The Logic of Power

Robert Chambers (publisher, born 1802) Foto

„It is desirable that the practical views entertained by sanitary reformers should be kept widely distinct from any such theories, the character of which has been well drawn by Malthus“

—  Robert Chambers (publisher, born 1802) Scottish publisher and writer 1802 - 1871

Fuente: Sanitary Economy (1850), p. 28-29
Contexto: It has been among the visions of some dreaming philosophers that human life is capable of almost indefinite extension. The great Condorcet was one of these. He thought that by the removal of the two causes of evil—poverty and superfluity—by destroying prejudices and superstitions, and by various other operations, which he considered the purification of mankind, but which other people would call their pollution, the approach of death would by degrees be farther and farther indefinitely protracted. It is desirable that the practical views entertained by sanitary reformers should be kept widely distinct from any such theories, the character of which has been well drawn by Malthus when he says—"... Though I may not be able in the present instance to mark the limit at which further improvement will stop I can very easily mention a point at which it will not arrive."

Pope John Paul II Foto

„(…) New knowledge has led to the recognition of the theory of evolution as more than a hypothesis. It is indeed remarkable that this theory has been progressively accepted by researchers, following a series of discoveries in various fields of knowledge. The convergence, neither sought nor fabricated, of the results of work that was conducted independently is in itself a significant argument in favor of this theory.“

—  Pope John Paul II 264th Pope of the Catholic Church, saint 1920 - 2005

(...) De nouvelles connaissances conduisent à reconnaître dans la théorie de l'évolution plus qu'une hypothèse. Il est en effet remarquable que cette théorie se soit progressivement imposée à l'esprit des chercheurs, à la suite d'une série de découvertes faites dans diverses disciplines du savoir. La convergence, nullement recherchée ou provoquée, des résultats de travaux menés indépendamment les uns des autres, constitue par elle même un argument significatif en faveur de cette théorie.
early news reports mistranslated the French phrase plus qu'une hypothèse as "more than one hypothesis". http://www.cartage.org.lb/en/themes/sciences/LifeScience/PhysicalAnthropology/EvolutionFact/Evolution/Evolution.htm
Message to the participants in the Plenary of the Pontifical Academy of Sciences, 22 October 1996
Fuente: Libreria Editrice Vaticana http://www.vatican.va/holy_father/john_paul_ii/messages/pont_messages/1996/documents/hf_jp-ii_mes_19961022_evoluzione_fr.html (French)

Johann Gottlieb Fichte Foto
Alexander Pope Foto

„A work of art that contains theories is like an object on which the price tag has been left.“

—  Alexander Pope eighteenth century English poet 1688 - 1744

Une oeuvre où il y a des théories est comme un objet sur lequel on laisse la marque du prix.
Marcel Proust, In Search of Lost Time, part VII: Time Regained, chapter III, "An Afternoon Party at the House of the Princesse de Guermantes" ( French version http://web.archive.org/web/20010708070436/http://gallica.bnf.fr/proust/TempsRetrouve.htm and English translation http://etext.library.adelaide.edu.au/p/proust/marcel/p96t/chapter3.html).
Misattributed

Napoleon I of France Foto
George Peacock Foto
Napoleon I of France Foto

„At dinner, he told us that he was much better, and we pointed out to him, about this, that, for some time however, he had not been out, and had been working eight, ten, or twelve hours a day. "That is just it," said he: "work is my element; I was born and made for it. I have found the limits of my legs; I have found the limits of my eyes; but I have never been able to find the limits of my labour."“

—  Napoleon I of France French general, First Consul and later Emperor of the French 1769 - 1821

A dîner, il nous disait qu'il se trouvait beaucoup mieux, et nous lui avons fait observer, à ce sujet, que, depuis quelque temps néanmoins, il ne sortait plus, et travaillat huit, dix, douze heures par jour.
«C'est cela même,» disait-il: «le travail est mon élément; je suis né et construit pour le travail. J'ai connu les limites de mes jambes, j'ai connu les limites de mes yeux; je n'ai jamais pu connaître celles de mon travail.»
Mémorial de Sainte Hélène, Volume 6, p. 272 https://play.google.com/books/reader?id=qSliAAAAcAAJ&printsec=frontcover&output=reader&hl=en&pg=GBS.PA272
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Albert Einstein Foto

„No fairer destiny could be allotted to any physical theory, than that it should of itself point out the way to the introduction of a more comprehensive theory, in which it lives on as a limiting case.“

—  Albert Einstein, libro Relativity: The Special and the General Theory

Es ist das schönste Los einer physikalischen Theorie, wenn sie selbst zur Aufstellung einer umfassenden Theorie den Weg weist, in welcher sie als Grenzfall weiterlebt.
Über die spezielle und die allgemeine Relativitätstheorie (1920) Tr. Robert W. Lawson, Relativity: The Special and General Theory (1920) pp. 90-91.
1920s

Niels Henrik Abel Foto
Augustus De Morgan Foto
Augustus De Morgan Foto
E. W. Hobson Foto

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