“As we meet again today, in a moment when democracy is under assault around the world, let us unite again and renew our conviction that democracy is not only the defining feature of American histories, but the essential ingredient to Americas’ futures.”

First inaugural address (January 20, 1993), Washington, D.C.
1990s

2008, A World that Stands as One (July 2008)
Context: People of Berlin — and people of the world — the scale of our challenge is great. The road ahead will be long. But I come before you to say that we are heirs to a struggle for freedom. We are a people of improbable hope. With an eye toward the future, with resolve in our hearts, let us remember this history, and answer our destiny, and remake the world once again.

Speech following the Minnesota primary (3 June 2008) http://www.cnn.com/2008/POLITICS/06/03/obama.speech/index.html
2008

2021, January, Presidential Inaugural Address (2021)

1940s, Fourth Inaugural Address (1945)
Context: We Americans of today, together with our allies, are passing through a period of supreme test. It is a test of our courage — of our resolve — of our wisdom — our essential democracy. If we meet that test — successfully and honorably — we shall perform a service of historic importance which men and women and children will honor throughout all time. As I stand here today, having taken the solemn oath of office in the presence of my fellow countrymen — in the presence of our God — I know that it is America's purpose that we shall not fail.

2021, January, Presidential Inaugural Address (2021)

(p. 221)
Sheltering Desert; Union Deutsche Verlangsgesellschaft Ulm (1958)
Context: All power operates on a narrow basis; it rests on a few chosen faculties, and always ruthlessly exploits the weak. But history has shown again and again that the weak of the present have become the strong of the future, whereas power of today has provided the ruins of tomorrow. Who can know today that attributes and capacities will be vital in a thousand years' time? Only the preservation of all our attributes, including our weaknesses, can carry us safely through into the uncertain future. But how can it be done? Certainly not by force which does not preserve but destroys. There is only one thing which preserves all things, including the weak, and that is love.

Let America Be America Again (1935)