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“If Congress can do whatever in their discretion can be done by money, and will promote the General Welfare, the Government is no longer a limited one, possessing enumerated powers, but an indefinite one …With respect to the two words ‘general welfare’, I have always regarded them as qualified by the detail of powers connected with them. To take them in a literal and unlimited sense would be a metamorphosis of the Constitution into a character which there is a host of proofs was not contemplated by its creators.”- James Madison

"[T]he powers of the federal government are enumerated; it can only operate in certain cases; it has legislative powers on defined and limited objects, beyond which it cannot extend its jurisdiction." -
James Madison, Speech to the Virginia Ratifying Convention, June 6, 1788, Elliot's Debates

"The powers delegated by the proposed Constitution to the federal government are few and defined. Those which are to remain in the State governments are numerous and indefinite. The former will be exercised principally on external objects, as war, peace, negotiation, and foreign commerce; with which last the power of taxation will, for the most part, be connected. The powers reserved to the several States will extend to all the objects which, in the ordinary course of affairs, concern the lives, liberties, and properties of the people, and the internal order, improvement, and prosperity of the State." - Federalist Paper #45, James Madison

"These words only express [...], and not to give them the unspecified also; or why any specification? They could not be so awkward in language as to mean, as we say, ‘all and some.’ And should this construction prevail, all limits to the federal government are done away. - Thomas Jefferson to Spencer Roane, 1815. ME 14:350

 “Our tenet ever was . . . that Congress had not unlimited powers to provide for the general welfare, but were restrained to those specifically enumerated; and that, as it was never meant that they should provide for that welfare but by the exercise of the enumerated powers, so it could not have been meant they should raise money for purposes which the enumeration did not place under their action.” - Thomas Jefferson, letter to Albert Gallatin, 1817. ME 15:133

"a distinct and independent power to do any act they please which might be for the good of the Union, would render all the preceding and subsequent enumerations of power completely useless. It would reduce the whole instrument to a single phrase, that of instituting a Congress with power to do whatever would be for the good of the United States; and, as they would be the sole judges of the good or evil, it would be also a power to do whatever evil they please… Certainly no such universal power was meant to be given them. It was intended to lace them up straitly within the enumerated powers and those without which, as means, these powers could not be carried into effect.” - Thomas Jefferson, Opinion on National Bank, February 15, 1791. ME 3:148

“Aided by a little sophistry on the words “general welfare,” [the federal branch claim] a right to do not only the acts to effect that which are specifically enumerated and permitted, but whatsoever they shall think or pretend will be for the general welfare.” - Thomas Jefferson to William Branch Giles, 1825. ME 16:147