“Everything has been said but not everyone has said it.”
At a committee hearing. Quoted multiple times by Harry Reid, e.g. Congressional Record Vol. 147, No. 83 https://www.congress.gov/congressional-record/2001/6/14/senate-section/article/S6239-7
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Morris Udall 4
American politician 1922–1998Related quotes

“'“Everything is true”, he said. “Everything anybody has ever thought.””
Source: Do Androids Dream of Electric Sheep? (1968), Chapter 20 (p. 227)

“It is not everyone,' said Elinor, 'who has your passion for dead leaves.”
Source: Sense and Sensibility
Hartshorne's main reflection on a full 100 years of life.
"A hundred years of thinking about God" (1998)

Toutes choses sont dites déjà; mais comme personne n'écoute, il faut toujours recommencer.
Le Traité du Narcisse https://fr.wikisource.org/wiki/Le_Trait%C3%A9_du_narcisse (The Treatise of the Narcissus)
Nothing is said that has not been said before. -- Terence

“Everything that has been will be, everything that will be is, everything that will be has been.”
Attributed in The Little Book of Romanian Wisdom (2011) edited by Diana Doroftei and Matthew Cross