„[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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—  Aristotle Classical Greek philosopher, student of Plato and founder of Western philosophy -384 - -322 a.C.
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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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—  Brian Campbell Vickery British information theorist 1918 - 2009
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„The bulk of the world’s knowledge is an imaginary construction.“

—  Helen Keller American author and political activist 1880 - 1968
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„There is no difference between knowledge and devotion,
Both of them save the soul from the miseries of worldly life.“

—  Tulsidas Hindu poet-saint 1532 - 1623
Tulsidas's philosophical approach, quoted in "Hindu spirituality: Postclassical and modern", p. 80

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„Recognition implies previous knowledge, otherwise you cannot recognize.“

—  Jiddu Krishnamurti Indian spiritual philosopher 1895 - 1986
Context: In seeking there are several things involved: there is the seeker and the thing that he seeks after. When the seeker finds what he thinks is truth, is God, is enlightenment, he must be able to recognize it. He must recognize it, right? Recognition implies previous knowledge, otherwise you cannot recognize. I cannot recognize you if I had not met you yesterday. Therefore when I say this is truth, I have already known it and therefore it is not truth. So a man who is seeking truth lives a life of hypocrisy, because his truth is the projection of his memory, of his desire, of his intentions to find something other than "what is", a formula. So seeking implies duality — the one who seeks and the thing sought after — and where there is duality there is conflict. There is wastage of energy. So you can never find it, you can never invite it. p. 157

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