"Every constitution, then, and every law, naturally expires at the end of nineteen years. If it be enforced longer, it is an act of force, and not of right."--Jefferson to Madison in 1789
"The idea that institutions established for the use of the nation cannot be touched nor modified even to make them answer their end because of rights gratuitously supposed in those employed to manage them in trust for the public, may perhaps be a salutary provision against the abuses of a monarch but is most absurd against the nation itself. Yet our lawyers and priests generally inculcate this doctrine and suppose that preceding generations held the earth more freely than we do, had a right to impose laws on us unalterable by ourselves, and that we in like manner can make laws and impose burdens on future generations which they will have no right to alter; in fine, that the earth belongs to the dead and not the living." --Thomas Jefferson to William Plumer, 1816.