Attributed in Zebras & Picket Fences (2008) by Jakob Weiss; if this is a statement by Feather, it clearly derives from the earlier remarks of Isaac D'Israeli: "The wisdom of the wise, and the experience of ages, may be preserved by quotation." Since at least 1986 a paraphrased form misattributed to his son Benjamin Disraeli has also often been quoted: "The wisdom of the wise and the experience of the ages are perpetuated by quotations."
Disputed
“I say quotations are literary. They are good only when dealing with ideas, not with experience. Experience should be pure, unique.”
June 5, 1936 Fire
Diary entries (1914 - 1974)
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Anaïs Nin 278
writer of novels, short stories, and erotica 1903–1977Related quotes

“we are unique individuals with unique experiences”
Men Are from Mars, Women Are from Venus

Letter to Charles Sawyer of Addison Gallery of Art October 19 , 1939
1911 - 1940

“The wisdom of the wise, and the experience of ages, may be preserved by quotation.”
Isaac D'Israeli, Curiosities of Literature, "Quotation".
Misattributed, Isaac D'Israeli
Variant: The wisdom of the wise and the experience of the ages are perpetuated by quotations.

“The wisdom of the wise, and the experience of ages, may be preserved by quotation.”
Quotation; since at least 1986 a paraphrased form misattributed to his son Benjamin Disraeli has often been quoted: "The wisdom of the wise and the experience of the ages are perpetuated by quotations."
Curiosities of Literature (1791–1834)

“The school system should be used purely for academia and not for social experiments.”

Journey to the East (1932)
Context: It was my destiny to join in a great experience. Having had the good fortune to belong to the League, I was permitted to be a participant in unique journey. What wonder it had at the time! How radiant and comet-like it seemed, and how quickly it has been forgotten and allowed to fall into disrepute. For this reason, I have decided to attempt a short description of this fabulous journey, a journey the like of which had not been attempted since the days of Hugo and mad Roland.

“A literary critic of experience never defines anything.”
Source: "Quotes", Interviews with Northrop Frye (2008), p. 4

He here refers to his proposal in "A unitary hypothesis of mind-brain interaction in the cerebral cortex" (1990); published in Proceedings of the Royal Society B 240, p. 433 - 451
How the Self Controls Its Brain (1994)
Context: The hypothesis has been proposed that all mental events and experiences, in fact the whole of the outer and inner sensory experiences, are a composite of elemental or unitary mental experiences at all levels of intensity. Each of these mental units is reciprocally linked in some unitary manner to a dendron … Appropriately we name these proposed mental units 'psychons.' Psychons are not perceptual paths to experiences. They are the experiences in all their diversity and uniqueness. There could be millions of psychons each linked uniquely to the millions of dendrons. It is hypothesized that it is the very nature of psychons to link together in providing a unified experience.