Moritz Schlick,
Meaning and verification.
(1938)
“ The possibility of verification does not rest on any ‘experiential thruth’, on a law of nature or any other true general proposition, but is determined solely by our definitions, by the rules which have been fixed for our language, or which we can fix arbitrarily at any moment. All of these rules ultimately point to ostensive definitions, as we have explained, and through them verifiability is linked to experience in the first sense of the word. ”
