Hayek's Journey: The Mind of Friedrich Hayek (2003)
“Any government is free to the people under it (whatever be the frame) where the law rules, and the people are a party to those laws, and more than this is tyranny, oligarchy, or confusion.”
Frame of Government (1682)
Context: I know what is said by the several admirers of monarchy, aristocracy and democracy, which are the rule of one, a few, and many, and are the three common ideas of government, when men discourse on the subject. But I chuse to solve the controversy with this small distinction, and it belongs to all three: Any government is free to the people under it (whatever be the frame) where the law rules, and the people are a party to those laws, and more than this is tyranny, oligarchy, or confusion.
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William Penn 53
English real estate entrepreneur, philosopher, early Quaker… 1644–1718Related quotes

Remarks by President Obama and Daw Aung San Suu Kyi of Burma in Joint Press Conference at Aung San Suu Kyi Residence in Rangoon, Burma on November 14, 2014 http://www.whitehouse.gov/the-press-office/2014/11/14/remarks-president-obama-and-daw-aung-san-suu-kyi-burma-joint-press-confe
2014

“There is no greater tyranny than that which is perpetrated under the shield of the law.”
As quoted in With Prejudice : The Perspective of an Acquitted Defendent (2010) by Vicky Gallas; no earlier occurence of this phrasing has been located (Relevant quote: "Il n’y a point de plus cruelle tyrannie que celle que l’on exerce à l’ombre des lois et avec les couleurs de la justice" i.e. "There is no tyranny more cruel than that which is exercised within the shade of the law and with the colours of justice." See Chap. XIV of Considérations sur les causes de la grandeur des Romains et de leur décadence).
Disputed

Speech in Chicago, Illinois http://www.bartleby.com/251/1002.html (9 July 1858)
1850s

Reported in The Episcopalian: Volume 138 (1973), p. 12.

Part III, Endgame, p. 195
2000s, How Life Imitates Chess (2007)
Indictment of Socialism (#3) http://debs.indstate.edu/b262b3_1914.pdf, transcript of Barnhill-Tichenor Debate on Socialism (1914)
This quote is often erroneously attributed to Thomas Jefferson