"... the Lorentz force law does double service (1) as definer of fields and (2) as predicter of motions. Here and elsewhere in science, as stressed not least by Henri Poincaré, that view is out of date which used to say, "Define your terms before you proceed." All the laws and theories of physics, including the Lorentz force law, have this deep and subtle character, that they both define the concepts they use (here B and E ) and make statements about these concepts. Contrariwise, the absence of some body of theory, law, and principle deprives one of the means properly to define or even to use concepts. Any forward step in human knowledge is truly creative in this sense: that theory, concept, law, and method of measurement—forever inseparable—are born into the world in union."
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Charles W. Misner, Kip S. Thorne, and John Archibald Wheeler in
https://en.wikiquote.org/wiki/Lorentz_force
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