Chomsky is a fairly wordy fellow, so it is difficult to paraphrase his thoughts in 90 words. Here goes. Chomsky argues that there really is no such thing as a concept for the "body", that is, we can observe it, measure it, characterize it, but we cannot define the body as a concept for philosophy. Therefore it is quite difficult for us to draw a distinction between the body and those things we might call phenomena - independent thought, reason, the soul, etc. - so it is impossible from a logical standpoint, according to Chomsky, to create theories which attempt to explain these phenomena because we have no body concept as a starting point. We have only popular, social and religious beliefs, none of which are based in logical philosophy.