In the interest of scientific work, more and more formulations in the unified language of unified science are becoming increasingly precise. No term of unified science, however, is free from imprecision, since all terms are based on terms that are essential for protocol statements, whose imprecision must be immediately obvious to everyone. Protocol Statements (1932)
The fiction of an ideal language composed of pure atomic statements is as metaphysical as the fiction of Laplace's 'spirit'. Scientific language, with its ever growing equipment of systematic symbol formations, can by no means be regarded as an approximation to such an ideal language. Protocol Statements (1932)