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.
Plato (2013). “The Republic: A Socratic Dialogue Concerning the Definition of Justice and the Order and Character of the Just City-State and the Just Man (Beloved Books Edition)”, p.322, Lulu Press, Inc