William Pitt, 1st Earl of Chatham's speech on the Excise Bill in the House of Commons (March 1763), as quoted in Lord Brougham "Historical Sketches of Statesmen Who Flourished in the Time of George III, Volume I" (p. 42), 1839.
"I Have a Dream". Martin Luther King, Jr.'s Address Delivered at the March on Washington for Jobs and Freedom, kinginstitute.stanford.edu. August 28, 1963.