“Cooperation is difficult in the absence of communication.”

13 January 1857 (p. 338)
1831 - 1863, Delacroix' 'Journal' (1847 – 1863)

Address to a joint session of Congress (August 12, 1974); in Public Papers of the Presidents of the United States: Gerald R. Ford, 1974, pp. 6–7
1970s
Context: I know well the coequal role of the Congress in our constitutional process. I love the House of Representatives. I revere the traditions of the Senate despite my too-short internship in that great body. As President, within the limits of basic principles, my motto toward the Congress is communication, conciliation, compromise, and cooperation.

Natural Philosophy of Time (1980) as quoted by Suk-Jun Kim, "Time felt and places imagined in my compositions" (2011)
Context: Although the peculiarly fundamental nature of time in relation to ourselves is evident as soon as we reflect that our judgments concerning time and events in time appear themselves to be 'in' time, whereas our judgments concerning space do not appear themselves in any obvious sense to be in space, physicists have been influenced far more profoundly by the fact that space seems to be presented to us all of a piece, whereas time comes to us only bit by bit. The past must be recalled by the dubious aid of memory, the future is hidden from us, and only the present is directly experienced. This striking dissimilarity between space and time has nowhere had a greater influence than in physical science based on the concept of measurement. Free mobility in space leads to the idea of the transportable unit length and the rigid measuring rod. The absence of free mobility in time makes it much more difficult for us to be sure that a process takes the same time whenever it is repeated.

Quotes, NYU Speech (2004)
Context: Our future is dependent upon increasing cooperation and interdependence in a world tied ever more closely together by technologies of communications and travel. The emergence of a truly global civilization has been accompanied by the recognition of truly global challenges that require global responses that, as often as not, can only be led by the United States — and only if the United States restores and maintains its moral authority to lead.

From the first Cosmos: ASO episode, Standing Up in the Milky Way.
2010s, Cosmos: A Spacetime Odyssey (2014)
Variant: Science is a cooperative enterprise, spanning the generations. It's the passing of a torch from teacher, to student, to teacher. A community of minds reaching back to antiquity and forward to the stars.

Speech to the press (3 December 1980), quoted in The Times (4 December 1980), p. 5
Member of the European Parliament

Source: Sentimental Education

Speculations (Essays, 1924)

Presidential campaign (April 12, 2015 – 2016), First presidential debate (September 26, 2016)