This Sir, was a time in which you clearly saw into the injustice of a State of Slavery, and in which you had just apprehensions of the horrors of its condition, it was now Sir, that your abhorrence thereof was so excited, that you publickly held forth this true and invaluable doctrine, which is worthy to be recorded and remember’d in all Succeeding ages. “We hold these truths to be Self evident, that all men are created equal, and that they are endowed by their creator with certain unalienable rights, that among these are life, liberty, and the pursuit of happyness.”

Here Sir, was a time in which your tender feelings for your selves had engaged you thus to declare, you were then impressed with proper ideas of the great valuation of liberty, and the free possession of those blessings to which you were entitled by nature; but Sir how pitiable is it to reflect, that altho you were so fully convinced of the benevolence of the Father of mankind, and of his equal and impartial distribution of those rights and privileges which he had conferred upon them, that you should at the Same time counteract his mercies, in detaining by fraud and violence so numerous a part of my brethren under groaning captivity and cruel oppression, that you should at the Same time be found guilty of that most criminal act, which you professedly detested in others, with respect to yourselves.

Benjamin Banneker (1731-1806) American naturalist, surveyor, almanac author, mathematician

Letter (1791-08-19) to Thomas Jefferson
    (Source)

See Jefferson.