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
John Dryden (1762). “The Dramatick Works of John Dryden, Esq. in Six Volumes: Volume the sixth. Containing Don Sebastian, King of Portugal. Amphitrion: or, The two sosia's. Cleomenes, The Spartan heroe. King Arthur: or, The British worthy. Love triumphant: or, Nature will prevail”, p.193