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.
Henry David Thoreau, Laura Ross (2009). “Walden, Or, Life in the Woods: Bold-faced Ideas for Living a Truly Transcendent Life”, p.373, Sterling Publishing Company, Inc.