A state without some means of change is without the means of its own conservation.

Burke, Edmund. "Speech on Conciliation with the Colonies." The Portable Edmund Burke, edited by Isaac Kramnick. Penguin, 2009.

Paine, Thomas. "Rights of Man." Rights of Man, Common Sense, and Other Political Writings, edited by Mark Philp. Oxford University Press, 2009.

Madison, James. "No. 51: How to maintain: make the parts check each other. Also, a federal system divides power further.--Madison (or Hamilton)." The Federalist: A Commentary on the Constitution of the United States, edited by Robert Scigliano. The Modern Library, 2001.

Hume, David. "A Treatise of Human Nature." The Clarendon Edition of the Works of David Hume, edited by David Fate Norton and Mary J. Norton. Vol. 1, Oxford University Press, 2007, bk. 3, pt. 2, sect. 2.