“America, at its best, is also courageous. Our national courage has been clear in times of depression and war, when defending common dangers defined our common good. Now we must choose if the example of our fathers and mothers will inspire us or condemn us. We must show courage”

Speech to Conservative Rally at Cheltenham (3 July 1982) http://www.margaretthatcher.org/document/104989, regarding the Falkland Islands War.
First term as Prime Minister
Context: When we started out, there were the waverers and the fainthearts. The people who thought that Britain could no longer seize the initiative for herself. The people who thought we could no longer do the great things which we once did. Those who believed that our decline was irreversible—that we could never again be what we were. There were those who would not admit it—even perhaps some here today—people who would have strenuously denied the suggestion but—in their heart of hearts—they too had their secret fears that it was true: that Britain was no longer the nation that had built an Empire and ruled a quarter of the world. Well they were wrong. The lesson of the Falklands is that Britain has not changed and that this nation still has those sterling qualities which shine through our history. This generation can match their fathers and grandfathers in ability, in courage, and in resolution. We have not changed. When the demands of war and the dangers to our own people call us to arms—then we British are as we have always been: competent, courageous and resolute.

Speech in Leeds (13 March 1925), quoted in On England, and Other Addresses (1926), p. 62.
1925
Context: We were not peculiarly impressed with speeches that talked of the glorious time that was coming after the war. We realised what the war meant in the world. We felt the foundations of civilisation in Europe cracking. We knew as business men that for a generation this country and the world would be as a whole far, far poorer, and we realised early the struggle that must result to repair the cracks in the foundations of our civilisation and to restore to the country that level of prosperity which she had enjoyed before the war. I think, too, many of us had little faith in supermen. I think that our experience in business had taught us that, as a matter of fact, there are no such things as supermen, and that we should have to rely on the innate common-sense, integrity, courage and faith of the common men and women of this country if we were to make good.

2000s, 2006, State of the Union (January 2006)

Original: Sono i momenti in cui corriamo dei rischi che mostrano il coraggio che abbiamo nel dire ciò che pensiamo.
Source: prevale.net

Robert Gould Shaw: Oration upon the Unveiling of the Shaw Monument http://www.holycross.edu/departments/english/sluria/wjspeech.htm (31 May 1897)
1910s, Memories and Studies (1911)

Source: Rising Strong

2000s, 2009, Farewell speech to the nation (January 2009)