The physicist who states a ...

The physicist who states a law of nature with the aid of a mathematical formula is abstracting a real feature of a real material world, even if he has to speak of numbers, vectors, tensors, state-functions, or whatever to make the abstraction.
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 Hilary Putnam

Quotes from the same author

Science is wonderful at destroying metaphysical answers, but incapable of providing substitute ones. Science takes away foundations without providing a replacement. Whether we want to be there or not, science has put us in the position of having to live without foundations. It was shocking when Nietzsche said this, but today it is commonplace; our historical position-and no end to it is in sight-is that of having to philosophise without 'foundations'.
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 Hilary Putnam
No sane person should believe that something is subjective merely because it cannot be settled beyond controversy.
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 Hilary Putnam