The Constitution on which our Union rests, shall be administered by me [as President] according to the safe and honest meaning contemplated by the plain understanding of the people of the United States at the time of its adoption - a meaning to be found in the explanations of those who advocated, not those who opposed it, and who opposed it merely lest the construction should be applied which they denounced as possible.

The Writings of Thomas Jefferson (ed. 1854)