I consider the foundation of the Constitution as laid on this ground: That “all powers not delegated to the United States, by the Constitution, nor prohibited by it to the States, are reserved to the States or to the people.”
To take a single step beyond the boundaries thus specially drawn around the powers of Congress, is to take possession of a boundless field of power, no longer susceptible of any definition.
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Thomas Jefferson, Opinion against the constitutionality of a National Bank (1791), also quoted in The Writings of Thomas Jefferson “Memorial Edition” (20 Vols., 1903-04) edited by Andrew A. Lipscomb and Albert Ellery Bergh, Vol. 3, p. 146.