Stress is the most natural means at our disposal to emphasize a linguistic contrast, to indicate the major element in a sequence.
- Sapir (1921), a pag.112

Such a contrast as that of 'go' between' ('one who goes between') and 'to go between' may be of quite secondary origin in English, but there is every reason to believe that analogous distinctions have prevailed at all times in linguistic history.
- Sapir (1921), a pag.112

The contrast between the subjective and objective series of personal pronouns [...] is in English associated with a difference of position. We say 'I see the man' but 'the man sees me' [...]
- Sapir (1921), a pag.159