„Notwithstanding their attacks on the basic conception of rationalism, on synthetic a priori judgments, that is, material propositions that cannot be contradicted by any experience, the empiricist posits the forms of being as constant.“

—  Max Horkheimer, p. 146.
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Max Horkheimer
1895 - 1973
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—  Max Weber German sociologist, philosopher, and political economist 1864 - 1920
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„If I cannot say a priori what elementary propositions there are, then the attempt to do so must lead to obvious nonsense. (5.5571)“

—  Ludwig Wittgenstein Austrian-British philosopher 1889 - 1951
Original German: Wenn ich die Elementarsätze nicht a priori angeben kann, dann muss es zu offenbarem Unsinn führen, sie angeben zu wollen.

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„A tautology's truth is certain, a proposition's possible, a contradiction's impossible.“

—  Ludwig Wittgenstein, Tractatus Logico-Philosophicus
Context: A tautology's truth is certain, a proposition's possible, a contradiction's impossible. (Certain, possible, impossible: here we have the first indication of the scale that we need in the theory of probability.) (4.464) Original German: Die Wahrheit der Tautologie ist gewiss, des Satzes möglich, der Kontradiktion unmöglich

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„Things appear to assume a broader and more diversified meaning, often seemingly contradicting the rational experience of yesterday. There is a striving to emphasize the essential character of the accidental.“

—  Paul Klee German Swiss painter 1879 - 1940
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„Refusal to believe until proof is given is a rational position; denial of all outside of our own limited experience is absurd.“

—  Annie Besant British socialist, theosophist, women's rights activist, writer and orator 1847 - 1933
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„Some philosophers fail to distinguish propositions from judgments; … But in the real world it is more important that a proposition be interesting than that it be true.“

—  Alfred North Whitehead English mathematician and philosopher 1861 - 1947
Context: Some philosophers fail to distinguish propositions from judgments; … But in the real world it is more important that a proposition be interesting than that it be true. The importance of truth is that it adds to interest. p. 259. Variant: It is more important that a proposition be interesting than that it be true. This statement is almost a tautology. For the energy of operation of a proposition in an occasion of experience is its interest, and its importance. But of course a true proposition is more apt to be interesting than a false one. As extended upon in Adventures of Ideas (1933), Pt. 4, Ch. 16.

„They are learned by the constant use of the language and cannot be taught in any other fashion.“

—  Richard Hamming American mathematician and information theorist 1915 - 1998
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