„[This work urges] a clearer separation, in the construction of economic knowledge, between reasoning and recognition of facts, for the better protection of both.“

—  Tjalling Koopmans, p. viii
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Tjalling Koopmans
1910 - 1985
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„Civilization is an enormous device for economizing on knowledge.“

—  Thomas Sowell American economist, social theorist, political philosopher and author 1930

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„A knowledge of the construction of the heavens has always been the ultimate object of my observations“

—  William Herschel German-born British astronomer, technical expert, and composer 1738 - 1822
Context: A knowledge of the construction of the heavens has always been the ultimate object of my observations...<!-- p. 269

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„The fact that no limits exist to the destructiveness of this weapon makes its very existence and the knowledge of its construction a danger to humanity as a whole. It is necessarily an evil thing considered in any light.“

—  Enrico Fermi Italian physicist 1901 - 1954
Context: Such a weapon goes far beyond any military objective and enters the range of very great natural catastrophes. By its very nature it cannot be confined to a military objective but becomes a weapon which in practical effect is almost one of genocide. It is clear that the use of such a weapon cannot be justified on any ethical ground which gives a human being a certain individuality and dignity even if he happens to be a resident of an enemy country... The fact that no limits exist to the destructiveness of this weapon makes its very existence and the knowledge of its construction a danger to humanity as a whole. It is necessarily an evil thing considered in any light. On the Hydrogen bomb in a minority addendum http://honors.umd.edu/HONR269J/archive/GACReport491030.html (co-authored with I. I. Rabi) to an official General Advisory Committee report for the Atomic Energy Commission (30 October 1949)

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„Does knowledge rest on construction in the sense that it only functions because the knowing system is operatively closed, therefore: because it can maintain no operative contact with the outside world; and because it therefore remains dependent, for everything that it constructs, on its own distinction between self-reference and allo-reference?“

—  Niklas Luhmann German sociologist, administration expert, and social systems theorist 1927 - 1998
Luhmann (1991) “Wie lassen sich latente Strukturen beobachten?,” in , Peter Krieg (eds.), Das Auge des Betrachters: Beiträge zum Konstruktivismus. Festschrift für Heinz von Foerster, Piper, München-Zürich, p. 71; cited in: Heinz von Foerster (1993) " For Niklas Luhmann: “How Recursive is Communication?” http://e1020.pbworks.com/f/fulltext-2.pdf". Tranlated by Richard Howe.

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„(...) 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
Note: 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 Source: 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)

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