There is no such thing as a ...

There is no such thing as a language, not if a language is anything like what many philosophers and linguists have supposed. Thereis therefore no such thing to be learned, mastered, or born with. We must give up the idea of a clearly defined shared structure which language-users acquire and then apply to cases.
 Donald Davidson

Quotes from the same author

Mental events such as perceivings, rememberings, decisions, and actions resist capture in the net of physical theory.
 Donald Davidson