“Stronger than all the armies is an idea that's time has come. … The time has come for equality of opportunity in sharing in government, in education, and in employment. It will not be stayed or denied. It is here!”
Paraphrasing Victor Hugo when speaking about the Civil Rights Act of 1964 http://www.senate.gov/artandhistory/history/minute/Civil_Rights_Filibuster_Ended.htm (10 June 1964)
1960s
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Everett Dirksen 5
United States Army officer 1896–1969Related quotes

“No army can withstand the strength of an idea whose time has come.”
Variant: No force on earth can stop an idea whose time has come

“An invasion of armies can be resisted, but not an idea whose time has come.”

“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.

Writing for the court, Brown v. Board of Education, 347 U.S. 483 (1954)
1950s

[Wong, Theresa, Brenda Yeoh, Fertility and the Family: An Overview of Pro-natalist Population Policies in Singapore, ASIAN METACENTRE RESEARCH PAPER SERIES, 2003, 12, http://www.populationasia.org/Publications/RP/AMCRP12.pdf]
1980s

2009, First Inaugural Address (January 2009)

On the decade which she fit in best, as quoted in Life and Lies of an Icon (1995) by Richard Witts.
Context: I would say the time has not yet come. I rebel against the present, whenever it is, because I have not seen any change, other than oppositions grow stronger. I would be a communist if it was more anarchist. Otherwise, I see only everything as an absurdity, so I can laugh and cry. I have lived in a continuation, from birth and growing towards death in a chain that cannot end. I don't see this decade then that decade. The same things happen in different guises. I am bohemian but at one time you would call me a hippie or a punk. I remain a bohemian whatever you call me. So maybe I am locked in the fifties. But I have never desired to grow up from my world as a child, which is when things are most clear and utopian. They are clear because you are at the center and you see all around you. When you get older you lose your sight … I lost something of my childishness when people around me start dying. Four of my family died within a year.

News conference in Vancouver, B.C. as quoted in The Globe and Mail. (8 September 2006).