The Passing of a Griceian

Davidson in the Griceian festchrift:

"A passing theory is _not_ a theory of what anyone (except perhaps a
philosopher) would call an _actual_ natural language. 'Mastery' of such a
language would be _useless_, since KNOWING A PASSING THEORY is only KNOWING
HOW to interpret a particular utterance on a particular occasion (p.169).
Neither the PRIOR theory nor the PASSING theory describes what we would
call THE LANGUAGE a person KNOWS. Is there a theory that would do better?
The idea of KNOWING a language is in trouble. But if we do say this we
should realise that we ERASED the BOUNDARY between "knowing a language" and
"knowing our way around the world generally""

Davidson, in Grandy & Warner, PGRICE,
Philosophical Grounds of Rationality: Intentions, Categories, Ends, p.169).