Rights of the British Colonies Asserted and Proved, 1764
The Colonists are by the law of nature free born, as indeed all men are, white or black. . . . Nothing better can be said in favor of a trade, that is the most shocking violation of the law of nature, has a direct tendency to diminish the idea of the inestimable value of liberty, and makes every dealer in it a tyrant, from the director of an African company to the petty chapman in needles and pins on the unhappy coast. It is a clear truth, that those who every day barter away other mens liberty, will soon care little for their own.