“It's not the first time I've noticed how much more power words have than ideas, particularly in France.”
Ce n'est pas la première fois que je remarque combien, en France particulièrement, les mots ont plus d’empire que les idées.
Indiana, pt. 1, ch. 2 (1832); Sylvia Raphael (trans.) Indiana (Oxford: Oxford University Press, 2000) p. 23
Original
Ce n'est pas la première fois que je remarque combien, en France particulièrement, les mots ont plus d’empire que les idées.
Indiana
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George Sand 38
French novelist and memoirist; pseudonym of Lucile Aurore D… 1804–1876Related quotes

Source: Vehicles: Experiments in Synthetic Psychology (1984), p. 26
Source: Attack of the Deranged Mutant Killer Monster Snow Goons

“There is nothing more powerful than an idea whose time has come.”
Often attributed to Hugo as a paraphrase of a similar idea in his Histore d'un Crime (1877): "One resists the invasion of armies; one does not resist the invasion of ideas", the wording of this famous statement actually more closely resembles a passage from the relatively obscure Les Francs-Tireurs (1861) by Gustave Aimard, p. 68 https://books.google.com/books/about/Les_francs_tireurs.html?id=mKI4AQAAIAAJ:
Il y a quelque chose de plus puissant que la force brutale des baïonnettes: c'est l'idée dont le temps est venu et l'heure est sonnée.
There is something more powerful than the brute force of bayonets: it is the idea whose time has come and hour struck.
Translated into English as The Freebooters : A Story of the Texan War (1861) https://archive.org/details/freebootersstory00aima, p. 57, Ward & Lock edition
Misattributed
Variant: More powerful than the mighty armies is an idea whose time has come.

"The Application of Thought to Textual Criticism", a lecture delivered on August 4, 1921

2000s, 2003, Remarks on U.S.-British relations and foreign policy (November 2003)

“Ideas are more powerful than guns.”
Wikinews interview with Tony Benn (8 August 2007), quote from approx 24min45 sec into interview.
2000s