“However far the phenomena transcend the scope of classical physical explanation, the account of all evidence must be expressed in classical terms. The argument is that simply by the word "experiment" we refer to a situation where we can tell others what we have done and what we have learned and that, therefore, the account of the experimental arrangement and of the results of the observations must be expressed in unambiguous language with suitable application of the terminology of classical physics.”

— Niels Bohr

Niels Bohr, "Discussions with Einstein on Epistemological Problems in Atomic Physics," in Paul Arthur Schilpp, Albert Einstein: Philosopher Scientist (1949) pp. 199-241.

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Niels Bohr 37

Danish physicist 1885–1962

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“We are accustomed to talking of church and state, and a whole series of pairs of words that go with them lay and ecclesiastical, secular and religious, spiritual and temporal, and so on. These pairs of words simply do not exist in classical Islamic terminology, because the dichotomy that these words express is unknown. They are used in the modern languages. In Arabic, they borrow the terminology used by Christian Arabs. They are fortunate in having a substantial Christian population using Arabic, and they therefore have a good part of the modern terminology at their disposal, in their own language. In Turkish, Persian, Urdu and other languages of Islam, they had to invent new words.”

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“We shall see that the mathematical treatment of the subject [of electricity] has been greatly developed by writers who express themselves in terms of the 'Two Fluids' theory. Their results, however, have been deduced entirely from data which can be proved by experiment, and which must therefore be true, whether we adopt the theory of two fluids or not. The experimental verification of the mathematical results therefore is no evidence for or against the peculiar doctrines of this theory.”

James Clerk Maxwell book A Treatise on Electricity and Magnetism

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“In classical Arabic and in the other classical languages of Islam there are no pairs of terms corresponding to lay and ecclesiastical, spiritual and temporal, secular and religious, because these pairs of words express a Christian dichotomy which has no equivalent in the world of Islam.”

Bernard Lewis (1916–2018) British-American historian

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“[I]n a fundamental description of nature we must "forget time"... this can be done in the classical and in the quantum theory.”

Carlo Rovelli (1956) Italian physicist

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“Theoretical physicists live in a classical world, looking out into a quantum-mechanical world. The latter we describe only subjectively, in terms of procedures and results in our classical domain.”

John S. Bell Introduction to the hidden-variable question

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“If we compare. e. g. the systems of classical mathematics and of intuitionistic mathematics, we find that the first is much simpler and technically more efficient, while the second is more safe from surprising occurences, e. g. contradictions. At the present time, any estimation of the degree of safety of the system of classical mathematics, in other words, the degree of plausibility of its principles, is rather subjective. The majority of mathematicians seem to regard this degree as sufficiently high for all practical purposes and therefore prefer the application of classical mathematics to that of intuitionistic mathematics. The latter has not, so far as I know, been seriously applied in physics by anybody.”

Rudolf Carnap (1891–1970) German philosopher

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“That is what we are against [the ancient-Greek ideas about art], because that is the key to the classic and tragic finality from which we must free ourselves.”

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1940's

“There is no surer way to misread any document than to read it literally. … As nearly as we can, we must put ourselves in the place of those who uttered the words, and try to divine how they would have dealt with the unforeseen situation; and, although their words are by far the most decisive evidence of what they would have done, they are by no means final.”

Learned Hand (1872–1961) American legal scholar, Court of Appeals judge

Giuseppe v. Walling (1944).
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“One of the evident facts about the world is the stability of empty space-time. In classical general relativity we can explain this as a consequence of the positive energy theorem… the positive energy theorem must extend in some suitable form to any viable quantum theory of gravity.”

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John Minford (1946) New Zealand sinologist

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