As far as direct observation of ourselves and others obtains, the pronunciation of the individual is never free from variations […] Hand in hand with this endless differentiation of speech goes infinite mixture of speech: the influence of one dialect upon the other which according to the neogrammarians brings about disturbances to the unexceptionable sound laws, and the leveling of the speech of the individuals which according to the same neogrammarians alone makes the unexceptionable sound laws possible: these processes of contrary effect are essentially the same. They are only mixture at different levels. (pp. 47-48)
- Schuchardt (1972), Pag.