The principle of enslaving human beings because they are inferior, is this. If a man is a cripple, trip him up. If he is old and weak, and bowed with the weight of years, strike him, for he cannot strike back. If idiotic, take advantage of him, and if a child, deceive him. This, sir, this is the doctrine of Democrats and the doctrine of devils as well, and there is no place in the universe outside the five points of hell and the Democratic Party where the practice and prevalence of such doctrines would not be a disgrace.

As quoted in His Brother's Blood: Speeches and Writings, 1838–64 (2004), edited by William Frederick Moore and Jane Ann Moore, p. 193 - Speech to the U.S. House of Representatives (April 1860)