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 Milton (1785). “Paradise Regain'd: A Poem, in Four Books. To which is Added Samson Agonistes: and Poems Upon Several Occasions. The Author John Milton. A New Edition. With Notes of Various Authors, by Thomas Newton, ...”, p.92