Full Idea
The thesis I want to refine and then argue for is that thought depends on speech.
Gist of Idea
Thought depends on speech
Source
Donald Davidson (Thought and Talk [1975], p.8)
Book Reference
'Mind and Language', ed/tr. Guttenplan,Samuel [OUP 1977], p.8
A Reaction
This has the instant and rather implausible implication that animals don't think. He is not, of course, saying that all thought is speech, which would leave out thinking in images. You can't do much proper thought without concepts and propositions.