"The powers not delegated to congress by the Constitution, nor prohibited by it to the states, are reserved to the states respectively, or to the people [quoting the 10th Amendment]. What we are about to consider are certainly not delegated to congress, nor are they noticed in the prohibitions to states; they are therefore reserved either to the states or to the people. Their high nature, their necessity to the general security and happiness will be distinctly perceived."
William Rawle, United States Attorney for Pennsylvania