“The traditional statement about language is that it is in itself living, and that writing is the dead part of language.”
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Jacques Derrida 58
French philosopher (1930-2004) 1930–2004Related quotes

No. 180: To a Mr. Thompson (incomplete draft of a letter, 1956).
The Letters of J. R. R. Tolkien (1981)
"Come Back, Dizzy" (p.187)
So This Is Depravity (1980)

“Writing obscures language; it is not a guise for language but a disguise.”
Source: Cours de linguistique générale (1916), p. 31

Sir Monier Monier-Williams in: Sanskrit-English dictionary https://books.google.co.in/books?id=j2j7AgAAQBAJ&pg=PR20, Рипол Рипол Классик, p. 20.

Interview with Ed Hirsch (1986), Writers at Work: The Paris Review Interviews, Eighth Series (Penguin, 1988)

Nobel Prize Lecture (1993)
Context: A dead language is not only one no longer spoken or written, it is unyielding language content to admire its own paralysis. Like statist language, censored and censoring. Ruthless in its policing duties, it has no desire or purpose other than maintaining the free range of its own narcotic narcissism, its own exclusivity and dominance. However moribund, it is not without effect for it actively thwarts the intellect, stalls conscience, suppresses human potential. Unreceptive to interrogation, it cannot form or tolerate new ideas, shape other thoughts, tell another story, fill baffling silences.

Source: 1930s, "Protocol Statements" (1932), p. 91