There are three basic problems: how a mind can know the world of nature, how it is possible for one mind to know another, and how it is possible to k… - Donald Davidson

I conclude that there is no such thing as a language, not if a language is anything like what many philosophers and linguists have supposed. There is 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. And we should try again to say how convention in any important sense is involved in language; or, as I think, we should give up the attempt to illuminate how we communicate by appeal to conventions.

The methodological advice to interpret in a way that optimizes agreement should not be conceived as resting on a charitable assumption about human intelligence that might turn out to be false. If we cannot find a way to interpret the utterances and other behaviour of a creature as revealing a set of beliefs largely consistent and true by our standards, we have no reason to count that creature as rational, as having beliefs, or as saying anything

In quotation not only does language turn on itself, but it does so word by word and expression by expression, and this reflexive twist is inseparable from the convenience and universal applicability of the device. Here we already have enough to draw the interest of the philosopher of language.