“Thinking would not be possible at all if we were not social; we would have no words, no abstract ideas, and no energy for anything outside of immediate sensuality.”

Interview (5 October 1990) as quoted in La Repubblica https://ricerca.repubblica.it/repubblica/archivio/repubblica/1990/10/05/parla-kaganovich-non-siamo-dei-mostri.html

Source: A Full Life: Reflections at Ninety

CNN Interview (2013)

Day of Affirmation Address (1966)
Context: The help and the leadership of South Africa or of the United States cannot be accepted if we, within our own country or in our relationships with others, deny individual integrity, human dignity, and the common humanity of man. If we would lead outside our borders, if we would help those who need our assistance, if we would meet our responsibilities to mankind, we must first, all of us, demolish the borders which history has erected between men within our own nations — barriers of race and religion, social class and ignorance.
Our answer is the world's hope; it is to rely on youth. The cruelties and the obstacles of this swiftly changing planet will not yield to obsolete dogmas and outworn slogans. It cannot be moved by those who cling to a present which is already dying, who prefer the illusion of security to the excitement and danger which comes with even the most peaceful progress. This world demands the qualities of youth: not a time of life but a state of mind, a temper of the will, a quality of the imagination, a predominance of courage over timidity, of the appetite for adventure over the love of ease.

The Discover Interview: Lisa Randall (July 2006)

Socialism (1922), Epilogue (1947)
Context: The only certain fact about Russian affairs under the Soviet regime with regard to which all people agree is: that the standard of living of the Russian masses is much lower than... the paragon of capitalism, the United States of America. If we were to regard the Soviet regime as an experiment, we would have to say that the experiment has clearly demonstrated the superiority of capitalism and the inferiority of socialism.

Speech on the anniversary of the Granma landing (2 December 1961)

The Liberals' Mistake (1987)
Context: There is a point at which material things offer less than do some nonmaterial things. We ought to be able to live on a reasonable level and at the same time have others live on a reasonable level. Then we would not be afraid to work in our cities, we would not be at war with ourselves, which is characteristic of people in this country. If we were at peace with ourselves, we would be able to see other less material, but still quite rewarding, horizons. In The Greening of America, I did not mean that we would all become richer in material things, I meant that we would all become richer in the totality. I still think it is possible for that vision to become a reality.