The right of self-defense is the first law of nature: in most
governments it has been the study of rulers to confine this right
within the narrowest limits possible. Wherever standing armies
are kept up, and when the right of the people to keep and bear
arms is, under any color or pretext whatsoever, prohibited,
liberty, if not already annihilated, is on the brink of
destruction."
-- Henry St. George Tucker (in Blackstone's Commentaries)