Whether he realizes it or not, however, Mr. Mets is affected every hour of his life not only by the words he hears and uses, but also by his unconscious assumptions about language. [...] Such unconscious assumptions determine the effect that words have on him — which in turn determines the way he acts, whether wisely or foolishly. Words — the way he uses them and the way he takes them when spoken by others — largely shape his beliefs, his prejudices, his ideals, his aspirations. They constitute the moral and intellectual atmosphere in which he lives — in short, his semantic environment.

p. 18 - Language in Thought and Action (1949) - The Niagara of Words