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
"Producer Adam Shankman Talks STEP UP REVOLUTION Blu-ray/DVD, Future STEP UP Movies, Directing GLEE’s Upcoming Christmas Episode, and More". Interview with Christina Radish, collider.com. November 27, 2012.