Full Idea
To imagine a totally irrational animal is to imagine an animal without thought.
Gist of Idea
Absence of all rationality would be absence of thought
Source
Donald Davidson (Davidson on himself [1994], p.232)
Book Reference
'A Companion to the Philosophy of Mind', ed/tr. Guttenplan,Samuel [Blackwell 1995], p.232
A Reaction
This wouldn't be so clear without the theory of evolution, which suggests that only the finders of truth last long enough to breed.