"As civil rulers, not having their duty to the people before them, may attempt to tyrannize, and as the military forces which must be occasionally raised to defend our country, might pervert their power to the injury of their fellow citizens, the people are confirmed by the article in their right to keep and bear their private arms."
(Tench Coxe in ‘Remarks on the First Part of the Amendments to the Federal Constitution' under the Pseudonym ‘A Pennsylvanian' in the Philadelphia Federal Gazette, June 18, 1789 at 2 col. 1)
"But when a long train of abuses and usurpations, pursuing invariably the same Object evinces a design to reduce them under absolute Despotism, it is their right, it is their duty, to throw off such Government, and to provide new Guards for their future security."
President Thomas Jefferson
"It is customary for republican governments to be bound by constitutions, and this is grand idea. The question does arise, however, about what recourse the citizen has when the government disregards its own constitution, as is the case with our own Tenth Amendment. What do you do if your government does not obey its own laws? Our Declaration declaims that when governments do not observe the God-given rights of man, it is not only the right but the duty of the people to alter or abolish them. The Declaration of Independence may not be the supreme law of the land - which is the Constitution - but it frames our philosophy of government and serves as a guide for those who respect our traditions. More people should."
Col. Jeff Cooper
"The strongest reason for the people to retain the right to keep and bear arms is, as a last resort, to protect themselves against tyranny in government."
Thomas Jefferson Papers
"Our Founding Fathers, having endured the tyranny of the British Empire, wanted to guarantee our God-given liberties. They devised our three branches of government and our system of checks and balances. But they were still concerned that the system could fail, and that we might someday face a new tyranny from our own government. They wanted us to be able to defend ourselves, and that's why they gave us the Second Amendment."
Mike Huckabee
***last one is my favorite as it pertains to the OP ***
"You need only reflect that one of the best ways to get yourself a reputation as a dangerous citizen these days is to go about repeating the very phrases which our founding fathers used in the struggle for independence."
Charles Austin Beard, American Historian, 1874-1948