Chief Justice John Marshall
"Let the end be legitimate, let it be within the
scope of the constitution, and all means which are appropriate, which are plainly adapted to that end, which are not prohibited, but consist with the letter and spirit of the constitution, are constitutional. ...[S]hould Congress, under the pretext of
executing its powers, pass laws for the
accomplishment of objects not entrusted to
the government, such [acts are] not the law of the land."