Eternal vigilance is the price of liberty.
Wendell Phillips, (1811-1884), abolitionist, orator and columnist for The Liberator
in a speech before the Massachusetts Antislavery Society in 1852, according to The Dictionary of Quotations edited by Bergen Evans
There is danger from all men. The only maxim of a free government ought to be to trust no man living with power to endanger the public liberty.
John Adams (1735-1826)