If one is interested in the ...

If one is interested in the relations between fields which, according to customary academic divisions, belong to different departments, then he will not be welcomed as a builder of bridges, as he might have expected, but will rather be regarded by both sides as an outsider and troublesome intruder.
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 Rudolf Carnap

Quotes from the same author

Metaphysicians are musicians without musical ability.
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 Rudolf Carnap
Science is a system of statements based on direct experience, and controlled by experimental verification. Verification in science is not, however, of single statements but of the entire system or a sub-system of such statements.
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 Rudolf Carnap