This quote is a paraphrase of the contents of the first chapter of Discourse on Voluntary Servitude. The quote appears in an edition titled Politics of Obedience: The Discourse of Voluntary Servitude edited by Murray Rothbard and Harry Kurz (1975), p. 39 http://books.google.com/books?id=6o-8P3iqf7IC&pg=PA39
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“The fundamental political question is why do people obey a government. The answer is that they tend to enslave themselves, to let themselves be governed by tyrants. Freedom from servitude comes not from violent action, but from the refusal to serve. Tyrants fall when the people withdraw their support.”
Introduction to Étienne de La Boétie's Politics of Obedience: The Discourse of Voluntary Servitude (1975), p. 39 http://books.google.com/books?id=6o-8P3iqf7IC&pg=PA39
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Murray N. Rothbard 43
American economist of the Austrian School, libertarian poli… 1926–1995Related quotes
Source: Give Me Liberty! (1998), Ch. 1 : We, the People, the New American Slaves, p. 8

As quoted in Philosophers of the Earth : Conversations with Ecologists (1972) by Anne Chisholm

Porphyry, On Abstinence from Killing Animals https://books.google.it/books?id=B5ojAwAAQBAJ&pg=PA0 as translated by Gillian Clark (2000), 1, 47, 3
Quoted by Porphyry

Source: Ma'alim fi'l-Tariq (Signposts on the Road, or Milestones) (1964), Ch. 4, p. 70.

Source: 1880s, Personal Memoirs of General U. S. Grant (1885), Ch. 16

"President: National tradition source of our strength" https://www.prezydent.pl/en/president-komorowski/news/art,640,president-national-tradition-source-of-our-strength.html (4 June 2014)