John Locke, George Berkeley, David Hume (2013). “The Empiricists: Locke: Concerning Human Understanding; Berkeley: Principles of Human Knowledge & 3 Dialogues; Hume: Concerning Human Understanding & Concerning Natural Religio”, p.334, Anchor
Eugene V. Debs' speech he gave across the street from a jail, where he had just visited three socialists who were in prison for opposing the draft, June 1918.