"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 in letter to James Robertson
"[Congressional jurisdiction of power] is limited to certain enumerated objects, which concern all the members of the republic, but which are not to be attained by the separate provisions of any." - James Madison, Federalist 14
"The powers delegated by the proposed Constitution to the federal government are few and defined . . . to be exercised principally on external objects, as war, peace, negotiation, and foreign commerce." - James Madison, Federalist 45
"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, subject to particular exceptions." - James Madison, 1792
“The Constitution allows only the means which are ‘necessary,’ not those which are merely ‘convenient,’ for effecting the enumerated powers. If such a latitude of construction be allowed to this phrase as to give any non-enumerated power, it will go to every one, for there is not one which ingenuity may not torture into a convenience in some instance or other, to some one of so long a list of enumerated powers. It would swallow up all the delegated powers, and reduce the whole to one power, as before observed" - Thomas Jefferson, 1791
"Congress has not unlimited powers to provide for the general welfare, but only those specifically enumerated." - Thomas Jefferson, 1798
"This specification of particulars [the 18 enumerated powers of Article I, Section 8] evidently excludes all pretension to a general legislative authority, because an affirmative grant of special powers would be absurd as well as useless if a general authority was intended." - Alexander Hamilton, Federalist 83
"No legislative act … contrary to the Constitution can be valid. To deny this would be to affirm that the deputy is greater than his principal; that the servant is above his master; that the representatives of the people are superior to the people themselves; that men acting by virtue of powers may do not only what their powers do not authorize, but what they forbid." - Alexander Hamilton, Federalist 78