„Philosophy... is that activity by which the meaning of propositions is established or discovered. Philosophy elucidates propositions, science verifies them. In the later we are concerned with the truth of statements, but in the former with what they actually mean.“

— Moritz Schlick, p. 157 ; As cited in: Uebel (2012:78)
Moritz Schlick Foto
Moritz Schlick
deutscher Physiker und Philosoph 1882 - 1936
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„Philosophy is not a system of propositions, and not a science.“

— Moritz Schlick German philosopher 1882 - 1936
p. 157 ; As cited in: Thomas Uebel (2012). Empiricism at the Crossroads: The Vienna Circle's Protocol-Sentence. p. 78

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„Philosophy is empty if it isn't based on science. Science discovers, philosophy interprets.“

— Albert Einstein German-born physicist and founder of the theory of relativity 1879 - 1955
p. 98

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„Philosophy rests on a proposition that whatever is is right. Preaching begins by assuming that whatever is is wrong.“

— Elbert Hubbard American writer, publisher, artist, and philosopher fue el escritor del jarron azul 1856 - 1915
The Philistine http://books.google.com/books?id=AoxHAAAAYAAJ&q="Philosophy+rests+on+a+proposition+that+whatever+is+is+right+preaching+begins+by+assuming+that+whatever+is+is+wrong"&pg=PA130#v=onepage (October 1897).

„Are there mathematical propositions for which there is a considerable amount of computational evidence, evidence that is so persuasive that a physicist would regard them as experimentally verified?“

— Gregory Chaitin Argentinian mathematician and computer scientist 1947
Thoughts on the Riemann hypothesis http://link.springer.com/article/10.1007/BF02985392 The Mathematical Intelligencer (December 2004) vol. 26, issue 1, pp. 4–7, quote on p. 4

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„Propositions are truth-functions of elementary propositions. (An elementary proposition is a truth-function of itself.) (5)“

— Ludwig Wittgenstein Austrian-British philosopher 1889 - 1951
Original German: Der Satz ist eine Wahrheitsfunktion der Elementarsätze

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„There is philosophy, which is about conceptual analysis — about the meaning of what we say — and there is all of this … all of life.“

— Alfred Jules Ayer English philosopher 1910 - 1989
Emphasizing his views on philosophy as something abstract and separate from normal life to Isaiah Berlin, in the early 1930s, as quoted in A.J. Ayer: A Life (1999) by Ben Rogers, p. 2.

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„Science can only arrange ethical propositions logically and furnish the means for the realization of ethical aims, but the determination of aims is beyond its scope.“

— Albert Einstein German-born physicist and founder of the theory of relativity 1879 - 1955
Context: I have found no better expression than "religious" for confidence in the rational nature of reality as it is accessible to human reason. Wherever this feeling is absent, science degenerates into uninspired empiricism. … I cannot accept your opinion concerning science and ethics or the determination of aims. What we call science has the sole purpose of determining what is. The determining of what ought to be is unrelated to it and cannot be accomplished methodically. Science can only arrange ethical propositions logically and furnish the means for the realization of ethical aims, but the determination of aims is beyond its scope. At least that is the way I see it. Letter to his friend Maurice Solovine (1 January 1951) p. 120

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