We should realize that we have abandoned not only the ordinary notion of a language, but we have erased the boundary between knowing a language and knowing our way around the world generally. For there are no rules for arriving at passing theories that work. . . . There is no more chance of regularizing, or teaching, this process than there is of regularizing or teaching the process of creating new theories to cope with new data — for that is what this process involves.
There is no such thing as language, not if a language is anything like what philosophers, at least, have supposed. There is therefore no such thing to be learned or mastered. We must give up the idea of a clearly defined shared structure which language users master and then apply to cases . . . We should give up the attempt to illuminate how we communicate by appeal to conventions.
— Donald Davidson, from “A Nice Derangement of Epitaphs”