The words 'theory' and 'practice' are of Greek origin; they carry our thoughts back to the ancient philosophers by whom they were contrived, and by whom they were also contrasted and placed in opposition, as denoting two mutually conflicting and mutually inconsistent ideas.... [this fallacy] based on a double system of natural laws retarded for centuries the development of physical science, notably mechanics.
Manual of Applied Mechanics (ed. 1868)