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. It is to be remarked that the phrase out of which this doctrine is elaborated, is copied from the old articles of Confederation, where it was always understood as nothing more than a general caption to the specified powers, and it is a fact that it was preferred in the new instrument for that very reason as less liable than any other to misconstruction.

Letter to Edmund Pendleton (1792-01-21)

To Edmund Pendleton, 21 January 1792[rotunda.upress.virginia.edu]