[...] the symbols of language are differentiated products of the vocal behaviour which is associated with the larinx of the higher mammals.
- Sapir (1921), a pag.7

Language is a purely human and non-instinctive method of communicating ideas, emotions and desires by means of a system of voluntarily produced symbols.
- Sapir (1921), a pag.8

[...] symbols are, in the first instance, auditory and they are produced by the so-called 'organs of speech'.
- Sapir (1921), a pag.8

[...] when [...] associated experiences are [...] associated with the image of a house [...] they begin to take on the nature of a symbol, a word, an element of language.
- Sapir (1921), a pag.11