William H. Seward's argument as defense attorney during the trial of an African-American criminal defendant, Auburn, New York (July 1846) as quoted in "Works of William H. Seward", Volume I (p. 417), 1853.
David Hume (1824). “The Philosophical Works of David Hume ... Containing Dialogues Concerning Natural Religion, Essays on the Immortality of the Soul, Suicide ... &c. A New Edition”, p.116