„Knowledge begins with practice, and theoretical knowledge, which is acquired through practice, must then return to practice. The active function of knowledge manifests itself not only in the active leap from perceptual to rational knowledge, but - and this is more important - it must manifest itself in the leap from rational knowledge to revolutionary practice.“

—  Mao Zedong
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Mao Zedong5
Vorsitzende der Kommunistischen Partei Chinas 1893 - 1976
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„Another evil, and one of the worst which arises from the separation of theoretical and practical knowledge, is the fact that a large number of persons“

—  William John Macquorn Rankine civil engineer 1820 - 1872
Context: Another evil, and one of the worst which arises from the separation of theoretical and practical knowledge, is the fact that a large number of persons, possessed of an inventive turn of mind and of considerable skill in the manual operations of practical mechanics, are destitute of that knowledge of scientific principles which is requisite to prevent their being misled by their own ingenuity. Such men too often spend their money, waste their lives, and it may be lose their reason in the vain pursuits of visionary inventions, of which a moderate amount of theoretical knowledge would be sufficient to demonstrate the fallacy; and for want of such knowledge, many a man who might have been a useful and happy member of society, becomes a being than whom it would be hard to find anything more miserable. The number of those unhappy persons — to judge from the patent-lists, and from some of the mechanical journals — must be much greater than is generally believed.<!--p. 176

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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 German philosopher, economist, sociologist, journalist and revolutionary socialist 1818 - 1883
Context: 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. Vol. I, Part 1, [The Materialist Conception of History].

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„There is a difference between the theoretical knowledge of socialism and the practical life of socialism. People are not born socialists, but must first be taught how to become them.“

—  Adolf Hitler Führer and Reich Chancellor of Germany, Leader of the Nazi Party 1889 - 1945
“German Volksgenossen!” Hitler’s opening speech at the new Winterhilfswerk, Deutschlandhalle, Berlin, October 5, 1937. Also quoted in https://books.google.com/books?id=l5gcZpnL5QUC&pg=PA224

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„To have real knowledge, one must understand the essence of things and not only their manifestations.“

—  Daniel Barenboim Israeli Argentine-born pianist and conductor 1942
Proms 2013: Daniel Barenboim interview http://www.theguardian.com/lifeandstyle/2012/nov/02/daniel-barenboim-conductor-interview, 8 May 2013.

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„To me programming is more than an important practical art. It is also a gigantic undertaking in the foundations of knowledge.“

—  Grace Hopper American computer scientist and United States Navy officer 1906 - 1992
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„The subject of philosophy is very ancient. The word means: "The love, study or pursuit of wisdom, or of knowledge of things and their causes, whether theoretical or practical."“

—  L. Ron Hubbard American science fiction author, philosopher, cult leader, and the founder of the Church of Scientology 1911 - 1986
Context: The subject of philosophy is very ancient. The word means: "The love, study or pursuit of wisdom, or of knowledge of things and their causes, whether theoretical or practical." All we know of science or of religion comes from philosophy. It lies behind and above all other knowledge we have or use. My Philosophy (1965) http://www.foundingchurchdc.org/dc/ref/philo/index.htm.

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