James Otis Quote

… [Slave] trade … is the most shocking violation of the law of nature, has a direct tendency to diminish … liberty, and makes every dealer in it a tyrant, from the director of an African company to the petty chapman [peddler]…. It is a clear truth, that those who every day barter away other men's liberty will soon care little for their own.

The Rights of British Colonists Asserted (1764).