Madison is warning "if Congress can employ money indefinitely to the general welfare, and are the sole and supreme judges of the general welfare, they may take the care of religion into their own hands" i.e. Separation of Religin and Government IS specified in the constitution. And, "Were the power of Congress to be established in the latitude contended for, it would subvert the very foundations, and transmute the very nature of the limited Government established by the people of America." Important phrase here, "sbvert the very foundations" He and other writers of the Constitution alwas warned citizens to be ever watchful of Government.