Every linguist knows that phonetic change is frequently followed by morphological rearrangements, but he is apt to assume that morphology exercises little or no influence on the course of phonetic history.
- Sapir (1921), a pag.183

[...] a simple phonetic law, meaningless in itself, may eventually color or transform large reaches of the morphology of a language.
- Sapir (1921), a pag.191

[...] important traits of morphology are frequently found distributed among widely differing languages within a large area, so widely differing [...] that it is customary to consider them genetically unrelated.
- Sapir (1921), a pag.204

[...] we shall ascribe the major concordances and divergences in linguistic form -phonetic pattern and morphology- to the autonomous drift of language, not to the complicating effect of single, diffused features that cluster now this way, now that.
- Sapir (1921), a pag.206

[...] if we substitute such radical words as 'man' and 'chick' for 'farmer' and 'duckling', we obtain a new material content [...] but not in the least a new structural mold.
- Sapir (1921), a pag.84