Thomas Jefferson on The Sources of Revenue

"The taxes with which we are familiar class themselves readily according to the basis on which they rest. 1. Capital. 2. Income. 3. Consumption. These may be considered as commensurate; Consumption being generally equal to Income, and Income the annual profit of Capital. A government may select either of these bases for the establishment of its system of taxation, and so frame it as to reach the faculties of every member of the society, and to draw from him his equal proportion of the public contributions; and, if this be correctly obtained, it is the perfection of the function of taxation. But when once a government has assumed its basis, to select and tax special articles from either of the other classes, is double taxation. For example, if the system be established on the basis of Income, and his just proportion on that scale has been already drawn from every one, to step into the field of Consumption and tax special articles in that, as broadcloth or homespun, wine or whiskey, a coach or a wagon, is doubly taxing the same article. For that portion of Income with which these articles are purchased, having already paid its tax as Income, to pay another tax on the thing it purchased, is paying twice for the same thing; it is an aggrievance on the citizens who use these articles in exoneration of those who do not, contrary to the most sacred of the duties of a government, to do equal and impartial justice to all its citizens."

Thomas Jefferson
3rd US President
Note to Destutt de Tracy's "Political Economy," 1816