“The truly revolutionary promise of our nation's founding document is the freedom to pursue happiness-with-a-capital-H.”

2008, Yes, we can speech (January 2008)

Memorial Day address, Arlington National Cemetery (31 May 1976) http://www.presidency.ucsb.edu/ws/index.php?pid=6071
1970s
Context: The founding of our Nation was more than a political event; it was an act of faith, a promise to Americans and to the entire world. The Declaration of Independence declared that people can govern themselves, that they can live in freedom with equal rights, that they can respect the rights of others.
In the two centuries that have passed since 1776, millions upon millions of Americans have worked and taken up arms when necessary to make that dream a reality. We can be extremely proud of what they have accomplished. Today, we are the world's oldest republic. We are at peace. Our Nation and our way of life endure. We are free.

"Italy", Ch. 18, p. 182
Source: Report to Greco (1965)

Source: The Power Elite (1956), P. 47.

Speech to the US Congress (13 October 1949)
Context: We have achieved political freedom but our revolution is not yet complete and is still in progress, for political freedom without the assurance of the right to live and to pursue happiness, which economic progress alone can bring, can never satisfy a people. Therefore, our immediate task is to raise the living standards of our people, to remove all that comes in the way of the economic growth of the nation. We have tackled the major problem of India, as it is today the major problem of Asia, the agrarian problem. Much that was feudal in our system of land tenure is being changed so that the fruits of cultivation should go to the tiller of the soil and that he may be secure in the possession of the land he cultivates. In a country of which agriculture is still the principal industry, this reform is essential not only for the well-being and contentment of the individual but also for the stability of society. One of the main causes of social instability in many parts of the world, more especially in Asia, is agrarian discontent due to the continuance of systems of land tenure which are completely out of place in the modem world. Another — and one which is also true of the greater part of Asia and Africa — is the low standard of living of the masses.

Olivia Ward (September 23, 2006) "Keep U.S., British forces in Iraq, says Talabani", The Toronto Star, p. A12.

Speech in West Calder, Scotland (27 November 1879), quoted in W. E. Gladstone, Midlothian Speeches 1879 (Leicester University Press, 1971), p. 117.
1870s
Context: [My sixth principle is that] the foreign policy of England should always be inspired by the love of freedom. There should be a sympathy with freedom, a desire to give it scope, founded not upon visionary ideas, but upon the long experience of many generations within the shores of this happy isle, that in freedom you lay the firmest foundations both of loyalty and order; the firmest foundations for the development of individual character; and the best provision for the happiness of the nation at large.

MTV's Diary, on his motivation

Presidency (1977–1981), The Crisis of Confidence (1979)
Context: We know the strength of America. We are strong. We can regain our unity. We can regain our confidence. We are the heirs of generations who survived threats much more powerful and awesome than those that challenge us now. Our fathers and mothers were strong men and women who shaped a new society during the Great Depression, who fought world wars, and who carved out a new charter of peace for the world.
We ourselves are the same Americans who just 10 years ago put a man on the Moon. We are the generation that dedicated our society to the pursuit of human rights and equality. And we are the generation that will win the war on the energy problem and in that process rebuild the unity and confidence of America.
We are at a turning point in our history. There are two paths to choose. One is a path I've warned about tonight, the path that leads to fragmentation and self- interest. Down that road lies a mistaken idea of freedom, the right to grasp for ourselves some advantage over others. That path would be one of constant conflict between narrow interests ending in chaos and immobility. It is a certain route to failure.
All the traditions of our past, all the lessons of our heritage, all the promises of our future point to another path, the path of common purpose and the restoration of American values. That path leads to true freedom for our Nation and ourselves. We can take the first steps down that path as we begin to solve our energy problem.
Energy will be the immediate test of our ability to unite this Nation, and it can also be the standard around which we rally. On the battlefield of energy we can win for our Nation a new confidence, and we can seize control again of our common destiny.