Address at the Sorbonne, Paris, 23 Apr. 1910. Richard M. Nixon quoted this passage in his address to the nation announcing his decision to resign the presidency, 8 Aug. 1974. See Theodore Roosevelt 1; Theodore Roosevelt 2; Theodore Roosevelt 5
Mikhail Sergeevich Gorbachev, Green Cross International (2011). “Mikhail Gorbachev: Prophet of Change : from the Cold War to a Sustainable World”, p.322, CLAIRVIEW BOOKS