A language presents itself to us, at any one moment, as a stable structure of lexical and grammatical habits. This however, is an illusion. Every language is undergoing, at all times, a slow but unceasing process of 'linguistic change'.
- Bloomfield (1935), a pag.281

Since the beginning of the nineteenth century we have learned to classify the differences between related forms, attributing them to several kinds of linguistic change.
- Bloomfield (1935), a pag.347