That the several states who formed that instrument, being sovereign and independent, have the unquestionable right to judge of its infraction; and that a nullification, by those sovereignties, of all unauthorized acts done under colour of that instrument, is the rightful remedy.
Thomas Jefferson[Emigrants] will bring with them the principles of the governments they leave, imbibed in their early youth; or, if able to throw off, it will be in exchange for an unbounded licentiousness, passing, as is usual, from one extreme to another. It would be a miracle were they to stop precisely at the point of temperate liberty.
Thomas JeffersonBut, you may ask, if the two departments [i.e., federal and state] should claim each the same subject of power, where is the common umpire to decide ultimately between them? In cases of little importance or urgency, the prudence of both parties will keep them aloof from the questionable ground; but if it can neither be avoided nor compromised, a convention of the States must be called to ascribe the doubtful power to that department which they may think best.
Thomas Jefferson