Individuals are the diversifying or centrifugal force in the growth of speech; for, as there are no two persons absolutely alike in countenance, so there are no two identical in character and education, and the shaping of influence exerted by each on the speech he has learned will be slightly different from that of every one else. But just so far as communication extends, like the centripetal force, which dominates the other, and keeps the moving body upon a certain track never too far remote from the centre, the individualities are curbed and restrained, and their jarring action forced into and held in accordance.
- Whitney (1875), a pag.163-164