Albert Einstein's speech made in honor of Thomas Mann, when Mann was given the Einstein Prize given by the Jewish Forum (January 1939), as quoted in Abraham Pais "Einstein Lived Here" (p. 214), 1994.
Letter to Mme. d'Épinal, Ferney on December 62, 1760. "Oeuvres Complètes de Voltaire: Correspondance". Book published by Garnier frères, Paris, Volume IX, letter #4390, p.124, 1881.