The Federalist Papers · Federalist No. 37 · paragraph 10

Not less arduous must have been the task of marking the proper line of partition between the authority of the general and that of the State governments. Every man will be sensible of this difficulty, in proportion as he has been accustomed to contemplate and discriminate objects extensive and complicated in their nature. The faculties of the mind itself have never yet been distinguished and defined, with satisfactory precision, by all the efforts of the most acute and metaphysical philosophers. Sense, perception, judgment, desire, volition, memory, imagination, are found to be separated by such delicate shades and minute gradations that their boundaries have eluded the most subtle investigations, and remain a pregnant source of ingenious disquisition and controversy. The boundaries between the great kingdom of nature, and, still more, between the various provinces, and lesser portions,…

Publius · Alexander Hamilton, John Jay, James Madison · 1787–1788
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