[...] we must more or less arbitrarily throw whole masses of experience together as similar enough to warrant their being looked upon -mistakenly, but conveniently- as identical.
- Sapir (1921), a pag.13

[...] grammar [...] is simply a generalized expression of the feeling that analogous concepts and relations are most conveniently symbolized in analogous forms.
- Sapir (1921), a pag.38

There is something irresistible about a method of classification that starts with two poles [...] say, by Chinese and Latin, clusters what it conveniently can about these poles, and throws everything else into a 'transitional type.'
- Sapir (1921), a pag.123