Cited (earlier) in: American Women Composers (1979) AWC news. Volumes 2-3. p. 41
Beauty is Revolution (1980)
“Since sounds have no natural connection with our ideas … the doubtfulness and uncertainty of their signification … has its cause more in the ideas they stand for than in any incapacity there is in one sound more than another to signify any idea.”
Book III, Ch. 9, sec. 4
An Essay Concerning Human Understanding (1689)
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John Locke 144
English philosopher and physician 1632–1704Related quotes

A royal puppet show in the Belgian royal family. The education of the first Belgian royal children. (Greet Donckers) http://www.ethesis.net/koningshuis/koningshuis_deel_II.htm#Hoofdstuk_2:_Publieke_sfeer%C2%A0_ AKP, Fund Leopold I, III Archives Conway, Letter from King Leopold I to Prince Leopold, 11 November 1850, 20/3.

“Nothing is more dangerous than an idea, when you have only one idea.”
Propos sur le Religion no. 74 (1938), under the pen name Alain.
Alternate translation: “Nothing is more dangerous than an idea, when it's the only one we have.” IZQuotes https://izquotes.com/quote/%C3%A9mile-chartier/nothing-is-more-dangerous-than-an-idea-when-you-have-only-one-idea-390165 (retrieved 10/30/18).

Source: Attributed from posthumous publications, Dialogues of Alfred North Whitehead (1954), Ch. 29, June 10, 1943.

"The Bugbear of Relativism," p. 89
The Culture We Deserve (1989)
Context: Can an idea — a notion as abstract as Relativism — produce by itself the effects alleged? cause all the harm, destroy all the lives and reputations? I am as far as anyone can be from denying the power of ideas in history, but the suggestion that a philosophy (as Relativism is often called) has perverted millions and debased daily life is on the face of it absurd. No idea working alone has ever demoralized society, and there have been plenty of ideas simpler and more exciting than Relativism.

On n'est point un homme d'esprit pour avoir beaucoup d'idées, comme on n'est pas un bon général pour avoir beaucoup de soldats.
Maximes et Pensées (Van Bever, Paris :1923), #446
Reflections

Section IV introduction.
Jack: Straight from the Gut (2001)

Source: 1915 - 1916, 100 Aphorisms', Franz Marc (1915), p. 445