“Complaints about the damage done to our "democracy" by outsiders are worse than silly. Such damage pales compared to what we Americans have done to a compact rooted in the consent of the governed and the drastically limited and delimited powers of those who govern.”

319 U.S. 641
Judicial opinions, West Virginia State Board of Education v. Barnette (1943)
Context: We set up government by consent of the governed, and the Bill of Rights denies those in power any legal opportunity to coerce that consent. Authority here is to be controlled by public opinion, not public opinion by authority.

As quoted in O₂ : Breathing New Life Into Faith (2008) by Richard Dahlstrom, Ch. 4 : Artisans of Hope: Stepping into God's Kingdom Story, p. 63; this source is disputed as it does not cite an original document for the quote. It is also used in <i> The White Rose </i> (1991) by Lillian Garrett-Groag, a monologue during Sophie's interrogation.
Disputed
Context: The real damage is done by those millions who want to "survive." The honest men who just want to be left in peace. Those who don't want their little lives disturbed by anything bigger than themselves. Those with no sides and no causes. Those who won't take measure of their own strength, for fear of antagonizing their own weakness. Those who don't like to make waves — or enemies. Those for whom freedom, honor, truth, and principles are only literature. Those who live small, mate small, die small. It's the reductionist approach to life: if you keep it small, you'll keep it under control. If you don't make any noise, the bogeyman won't find you. But it's all an illusion, because they die too, those people who roll up their spirits into tiny little balls so as to be safe. Safe?! From what? Life is always on the edge of death; narrow streets lead to the same place as wide avenues, and a little candle burns itself out just like a flaming torch does. I choose my own way to burn.

The Farmer Refuted (1775)
Context: The origin of all civil government, justly established, must be a voluntary compact, between the rulers and the ruled; and must be liable to such limitations, as are necessary for the security of the absolute rights of the latter; for what original title can any man or set of men have, to govern others, except their own consent? To usurp dominion over a people, in their own despite, or to grasp at a more extensive power than they are willing to entrust, is to violate that law of nature, which gives every man a right to his personal liberty; and can, therefore, confer no obligation to obedience.

Brexit: Force new EU poll on next PM, says Mark Drakeford https://www.bbc.co.uk/news/uk-wales-politics-48771928 BBC News (26 June 2019)
2019

Ma Ying-jeou (2013) cited in: " Time not right for political talks with China: Ma http://www.taipeitimes.com/News/front/archives/2013/10/26/2003575395" in Taipei Times, 26 October 2013.
Statement made in commenting his record-low approval rating and saying that he has no desire to change the cross-strait relations policies, 25 October 2013.
Other topics

Letter to The Times http://coreyrobin.files.wordpress.com/2012/07/hayek-letter-to-the-times-july-11-1978.pdf (11 July 1978), p. 15
1960s–1970s

"Virginia Resolution of 1798" (December 1798)
1790s

2013, Commencement Address at Ohio State University (May 2013)
Context: That’s precisely what the founders left us: the power to adapt to changing times. They left us the keys to a system of self-government – the tool to do big and important things together that we could not possibly do alone. To stretch railroads and electricity and a highway system across a sprawling continent. To educate our people with a system of public schools and land grant colleges, including Ohio State. To care for the sick and the vulnerable, and provide a basic level of protection from falling into abject poverty in the wealthiest nation on Earth. To conquer fascism and disease; to visit the Moon and Mars; to gradually secure our God-given rights for all our citizens, regardless of who they are, what they look like, or who they love. 
We, the people, chose to do these things together. Because we know this country cannot accomplish great things if we pursue nothing greater than our own individual ambition. 
Still, you’ll hear voices that incessantly warn of government as nothing more than some separate, sinister entity that’s the root of all our problems, even as they do their best to gum up the works; or that tyranny always lurks just around the corner.  You should reject these voices. Because what they suggest is that our brave, creative, unique experiment in self-rule is just a sham with which we can’t be trusted.
We have never been a people who place all our faith in government to solve our problems, nor do we want it to. But we don’t think the government is the source of all our problems, either. Because we understand that this democracy is ours.  As citizens, we understand that America is not about what can be done for us. It’s about what can be done by us, together, through the hard and frustrating but absolutely necessary work of self-government. 
The founders trusted us with this awesome authority. We should trust ourselves with it, too. Because when we don’t, when we turn away and get discouraged and abdicate that authority, we grant our silent consent to someone who’ll gladly claim it.