The turpitude, the inhumanity, the cruelty, and the infamy of the African commerce in slaves, have been so impressively represented to the public by the highest powers of eloquence, that nothing that I can say would increase the just odium in which it is and ought to be held. Every measure of prudence, therefore, ought to be assumed for the eventual total extirpation of slavery from the United States.

Letter to Robert J. Evans (1819)