Full Idea
I don't believe that folk psychology says there is a language of thought.
Clarification
That is, ordinary talk of mental lives does not imply that we have an inner language in the brain
Gist of Idea
Folk psychology doesn't say that there is a language of thought
Source
David Lewis (Lewis: reduction of mind (on himself) [1994], p.422)
Book Reference
'A Companion to the Philosophy of Mind', ed/tr. Guttenplan,Samuel [Blackwell 1995], p.422
A Reaction
This is aimed at Jerry Fodor. Certainly folk psychology is a strong theory, but a so-called 'language of thought' (the brain's machine code) seems a much weaker one.