[...] the motor processes involved in speech (such as the movements of the glottal cords in the larynx, the movements of the tongue required to pronounce the vowels, lip movements required to articulate certain consonants [...]) are localized in the motor tract precisely as are all other impulses to special motor activities.
- Sapir (1921), a pag.9

The word 'house' is not a linguistic fact if by it is meant merely the acoustic effect produced on the ear by its constituent consonants and vowels, pronounced in a certain order; nor the motor processes and tactile feelings which make up the articulation of the word [...]
- Sapir (1921), a pag.11

The motor processes and the accompanying motor feelings are [...] merely a means and a control leading to auditory perception in both speaker and hearer.
- Sapir (1921), a pag.17