Here are a few of my favorites...
Remember, democracy never lasts long. It soon wastes, exhausts, and murders itself. There never was a democracy yet that did not commit suicide. – John Adams (1814)
The more corrupt the state, the more it legislates. – Tacitus
Government is not reason; it is not eloquence; it is force. Like fire, it is a dangerous servant and a fearful master. – George Washington
Democracy must be something more than two wolves and a sheep voting on what to have for dinner. – James Bovard (1994)
The legitimate powers of government extend to such acts only as are injurious to others. But it does me no injury for my neighbor to say there are twenty gods, or no god. It neither picks my pocket nor breaks my leg. – Thomas Jefferson (1781)
[Political] offices are as acceptable here as elsewhere, and whenever a man cast a longing eye on them, a rottenness begins in his conduct. – Thomas Jefferson (1799)