“Our commitment to human rights must be absolute, our laws fair, our natural beauty preserved; the powerful must not persecute the weak, and human dignity must be enhanced.”

Truman Library address (2006)
Context: Both security and development ultimately depend on respect for human rights and the rule of law.
— Although increasingly interdependent, our world continues to be divided — not only by economic differences, but also by religion and culture. That is not in itself a problem. Throughout history, human life has been enriched by diversity, and different communities have learnt from each other. But, if our different communities are to live together in peace we must stress also what unites us: our common humanity, and our shared belief that human dignity and rights should be protected by law.

"Barack Obama: The President's News Conference With Prime Minister Reinfeldt of Sweden in Stockholm" by Gerhard Peters and John T. Woolley, atThe American Presidency Project (4 September 2013)
2013

Fiji Day address, 10 October 2005 (excerpts)

Toast at a celebration of Thomas Jefferson's birthday (13 April 1830); as quoted in Public Men and Events from the Commencement of Mr. Monroe's Administration, in 1817, to the Close of Mr. Fillmore's Administration, in 1853 (1875) by Nathan Sargent

Progress, Coexistence and Intellectual Freedom (1968), The Basis for Hope, A Summary of Proposals
Context: The strategy of peaceful coexistence and collaboration must be deepened in every way. Scientific methods and principles of international policy will have to be worked out, based on scientific prediction of the immediate and more distant consequences.
The initiative must be seized in working out a broad program of struggle against hunger.
A law on press and information must be drafted, widely discussed, and adopted, with the aim not only of ending irresponsible and irrational censorship, but also of encouraging self-study in our society, fearless discussion, and the search for truth. The law must provide for the material resources of freedom of thought.
All anti-constitutional laws and decrees violating human rights must be abrogated.

2015, Remarks to the Kenyan People (July 2015)

Source: An Essay on The Principle of Population (First Edition 1798, unrevised), Chapter X, paragraph 29, lines 12-15

1960s, Where Do We Go from Here: Chaos or Community? (1967)
Context: We must reaffirm our commitment to nonviolence. I want to stress this. The futility of violence in the struggle for racial justice has been tragically etched in all the recent Negro riots. Yesterday, I tried to analyze the riots and deal with their causes. Today I want to give the other side. There is certainly something painfully sad about a riot. One sees screaming youngsters and angry adults fighting hopelessly and aimlessly against impossible odds. And deep down within them, you can see a desire for self-destruction, a kind of suicidal longing.
Occasionally Negroes contend that the 1965 Watts riot and the other riots in various cities represented effective civil rights action. But those who express this view always end up with stumbling words when asked what concrete gains have been won as a result. At best, the riots have produced a little additional anti-poverty money allotted by frightened government officials and a few water sprinklers to cool the children of the ghettos. It is something like improving the food in the prison while the people remain securely incarcerated behind bars.

1960s, I Have A Dream (1963)
Context: Let us not seek to satisfy our thirst for freedom by drinking from the cup of bitterness and hatred. We must forever conduct our struggle on the high plane of dignity and discipline. We must not allow our creative protest to degenerate into physical violence. Again and again we must rise to the majestic heights of meeting physical force with soul force.
Context: The whirlwinds of revolt will continue to shake the foundations of our nation until the bright day of justice emerges. But there is something that I must say to my people who stand on the warm threshold which leads into the palace of justice. In the process of gaining our rightful place we must not be guilty of wrongful deeds. Let us not seek to satisfy our thirst for freedom by drinking from the cup of bitterness and hatred. We must forever conduct our struggle on the high plane of dignity and discipline. We must not allow our creative protest to degenerate into physical violence. Again and again we must rise to the majestic heights of meeting physical force with soul force.