This site has all sorts of quotes about freedom, vigilance, etc. These strikes me as appropriate given the recent Supreme Court ruling in Kelo:
"The greatest tyrannies are always perpetrated in the name of the noblest causes." -- Thomas Paine
"I have a right to nothing which another has a right to take away." -- Thomas Jefferson to Uriah Forrest, 1787. Papers, 12:477.
"Now what liberty can there be where property is taken without consent??" -- Samuel Adams, founding father and leader of the Boston Tea Party
"Property must be secured, or liberty cannot exist." -- John Adams