“Without a constant misuse of language, there cannot be any discovery, any progress.”

Source: Looking Backward, 2000-1887 http://www.gutenberg.org/ebooks/25439 (1888), Ch. 6.

p 11; this was originally listed here in a somewhat misleading form combining it with another statement on the interpretations of dreams on p. 14: No language exists that cannot be misused … Every Interpretation is hypothetical, for it is a mere attempt to read an unfamiliar text.
Modern Man in Search of a Soul (1933)
Context: It is imperative that we should not pare down the meaning of a dream to fit some narrow doctrine. … No language exists that cannot be misused. It is hard to realize how badly we are fooled by the abuse of ideas, it even seems as if the unconscious had a way of strangling the physician in the coils of his own theory.

On Seeing Plays (1990).
Context: It is mankind's discovery of language which more than any other single thing has separated him from the animal creation. Without language, what concept have we of past or future as separated from the immediate present? Without language, how can we tell anyone what we feel, or what we think? It might be said that until he developed language, man had no soul, for without language how could he reach deep inside himself and discover the truths that are hidden there, or find out what emotions he shared, or did not share, with his fellow men and women. But because this greatest gift of all gifts is in daily use, and is smeared, and battered and trivialized by commonplace associations, we too often forget the splendour of which it is capable, and the pleasures that it can give, from the pen of a master.

Address at the Cow Palace on Accepting the Nomination of the Republican National Convention (August 23, 1956). Source: Eisenhower Presidential Library. Archived https://web.archive.org/web/20210125121539/https://www.eisenhowerlibrary.gov/eisenhowers/quotes from the original https://www.eisenhowerlibrary.gov/eisenhowers/quotes on Janunary 25, 2021.
1950s

(1974) cited by David Crystal, "English as a Global Language" (2003), Cambridge University Press, ISBN 9780521530323, p. 124.

Source: "The Latest Attack on Metaphysics" (1937), p. 146.

As quoted in "Russia’s Chulpan Khamatova on Stalinist Backlash Over ‘Zuleikha’ (EXCLUSIVE)" in Variety (10 June 2020) https://variety.com/2020/tv/news/chulpan-khamatova-communist-backlash-zuleikha-1234627594/

Le Catéchisme positiviste (1852)
Context: Social positivism only accepts duties, for all and towards all. Its constant social viewpoint cannot include any notion of rights, for such notion always rests on individuality. We are born under a load of obligations of every kind, to our predecessors, to our successors, to our contemporaries. These obligations then increase or accumulate, for it is some time before we can return any service. … Any human right is therefore as absurd as immoral. Since there are no divine rights anymore, this concept must therefore disappear completely as related only to the preliminary regime and totally inconsistent with the final state where there are only duties based on functions.

Source: 1960s, Understanding Media (1964), p. 80