The right of the people to keep and bear arms has been recognized by the General Government; but the best security of that right after all is, the military spirit, that taste for martial exercises, which has always distinguished the free citizens of these States….Such men form the best barrier to the liberties of America
— Gazette of the United States, October 14, 1789.

You must understand, therefore, that there are two ways of fighting: by law or by force. The first way is natural to men, and the second to beasts. But as the first way often proves inadequate one must have recourse to the second.
— Niccolo Machiavelli

It is interesting to hear certain kinds of people insist that the citizen cannot fight the government. This would have been news to the men of Lexington and Concord, as well as the Mujahedeen in Afghanistan.
The citizen most certainly can fight the government, and usually wins when he tries.
Organized national armies are useful primarily for fighting against other organized national armies. When they try to fight against the people, they find themselves at a very serious disadvantage.
If you will just look around at the state of the world today, you will see that the guerillero has the upper hand.
Irregulars usually defeat regulars, providing they have the will. Such fighting is horrible to contemplate, but will continue to dominate brute strength.

-Jeff Cooper

The congress of the United States possesses no power to regulate, or interfere with the domestic concerns, or police of any state: it belongs not to them to establish any rules respecting the rights of property; nor will the constitution permit any prohibition of arms to the people; or of peaceable assemblies by them, for any purposes whatsoever, and in any number, whenever they may see occasion. —St George Tucker, 1803

Yet, today, here we are………..

Certainly one of the chief guarantees of freedom under any government, no matter how popular and respected, is the right of the citizen to keep and bear arms. The right of the citizens to bear arms is just one guarantee against arbitrary government, one more safeguard against the tyranny which now appears remote in America but which historically has proven to always be possible. — Sen. Hubert Humphrey, 1960

Firearms have been around for over 400 years, yet it is only in the last 20 years that people have begun shouting “gun control”. Why then, only recently, has this become such an issue? Moreover, why are there more mass-murderers than at any other time in our known history? It is not because weapons are more powerful — 200-year-old muzzleloaders have a much greater force-per-round than today’s “assault rifles”. It is not because weapons are semi- or fully-automatic — rapid-fire weapons have been available for most of the last century. It is not due to a lack of laws — we have more “gun control” laws than ever. It IS, however, because we have chosen to focus on “gun control” instead of crime control or “thug control.” It IS because only recently has the public become complacent enough to accept, by inaction, the violence present in our society.
– Kevin Langston

“On every question of construction (of the Constitution) let us carry ourselves back to the time when the Constitution was adopted, recollect the spirit manifested in the debates, and instead of trying what meaning may be squeezed out of the text, or invented against it, conform to the probable one in which it was passed.”
–Thomas Jefferson, 1823