“And those people should not be listened to who keep saying the voice of the people is the voice of God, since the riotousness of the crowd is always very close to madness.”
Variant translation: We should not listen to those who like to affirm that the voice of the people is the voice of God, for the tumult of the masses is truly close to madness.
Works, Epistle 127 (to Charlemagne, AD 800)
Original
Nec audiendi qui solent dicere, vox populi, vox Dei, quum tumultuositas vulgi semper insaniae proxima sit.
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Alcuin 2
English scholar and abbot 735–804Related quotes

“There's always a voice saying the right thing to you somewhere, if you'll only listen for it.”
Source: Tom Brown at Oxford (1861), Ch. 48

"In Egypt Land," December 30, 1946
TIME magazine (1939-1948)

There is no other way.
1960s, Memorial Day speech (1963)
Supporting the removal of the essay Three Hundred Ramayanas from the Delhi University's syllabus, as quoted in " The rule of unreason http://www.frontline.in/static/html/fl2823/stories/20111118282312500.htm", The Frontline (November 2011)

In an interview with Kara Swisher as quoted in Zuckerberg: The Recode interview https://www.recode.net/2018/7/18/17575156/mark-zuckerberg-interview-facebook-recode-kara-swisher (July 18, 2018), Recode.

“Where the voice of the people is heard, elite groups must insure their voice says the right things”
“Though Control in the USA: The Case of the Middle East,” Index on Censorship, July/August 1986, quoted in John H. George, Be Reasonable: Selected Quotations for Inquiring Minds, Prometheus Books, 1994 p. 64
Quotes 1960s-1980s, 1980s
Context: From a comparative perspective, the United States is unusual if not unique in the lack of restraints on freedom of expression. It is also unusual in the range and effectiveness of methods employed to restrain freedom of thought... Where the voice of the people is heard, elite groups must insure their voice says the right things… The less the state is able to employ violence in the defense of the interest of the elite groups that effectively dominate it, the more it becomes necessary to devise techniques of ‘manufacture of consent’… Where obedience is guaranteed by violence, rulers may tend towards a ‘behaviourist’ conception; it is enough that people obey; what they think does not matter too much. Where the state lacks means of coercion, it is important to control what people think.

At Endy Kenny on 27 June 2013 http://www.kildarestreet.com/sendebates/?id=2013-06-27a.134#g174