The gap between monopropositional sentences and multipropositional sentences is the gap between talking only about observables in the external world and communicating the contents of one’s mind. And the bridging of that gap must have constituted the greatest single step in what anthropologists mean by the ugly terms “hominization” or “sapientization”–the process of becoming the kind of species that we are today.
- Bickerton (1981), a pag.275-276