And what country can preserve its liberties, if its rulers are not warned from time to time that this people preserve the spirit of resistance? Let them take arms... The tree of liberty must be refreshed from time to time with the blood of patriots and tyrants. It is it's natural manure.~Thomas Jefferson, letter to William S. Smith, Paris, Nov. 13, 1787
Complete letter is here:
http://odur.let.rug.nl/~usa/P/tj3/writi ... jefl64.htm
The tree of liberty only grows when watered by the blood of tyrants.~Bertrand Barere de Vieuzac. (1755–1841), speech in the Convention Nationale, 1792.