It is impossible for men who exercise their reason to believe that any one part of the human race has been marked out by God or nature as so superior to any other. No man is by nature, or by manifest declaration of God's will, the possessor or possession, the master or slave, of another. Whoever asserts such a right to such domination or possession is, in Congress's words from that same document, 'rightfully resistible'.

p. 370 - A New Birth of Freedom: Abraham Lincoln and the Coming of the Civil War (2000)