Source: The Functions of the Executive (1938), p. 282
“And the ability of citizens to organize and advocate for change -- that's the oxygen upon which democracy depends.”
2015, Remarks to the Kenyan People (July 2015)
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44th President of the United States of America 1961Related quotes

Speech to the American Bar Association (15 July 1985) http://www.margaretthatcher.org/speeches/displaydocument.asp?docid=106096.
See Linda Smith for an amusing variant.
Second term as Prime Minister

Source: 1940s, Frontiers in group dynamics II, 1947, p. 153.
Daniel Katz (1964) ""The motivational basis of organizational behavior". In: Behavioral science, 1964. p. 132

“The ability to think for one's self depends upon one's mastery of the language.”
Source: Slouching Towards Bethlehem

On Truth and Lie in an Extra-Moral Sense (1873)
Context: Everything which distinguishes man from the animals depends upon this ability to volatilize perceptual metaphors in a schema, and thus to dissolve an image into a concept. For something is possible in the realm of these schemata which could never be achieved with the vivid first impressions: the construction of a pyramidal order according to castes and degrees, the creation of a new world of laws, privileges, subordinations, and clearly marked boundaries — a new world, one which now confronts that other vivid world of first impressions as more solid, more universal, better known, and more human than the immediately perceived world, and thus as the regulative and imperative world.

TED Conference http://www.ted.com/talks/sir_ken_robinson_bring_on_the_revolution.html

Part III, Chapter XIII, The Reservoir Plan and Credit Control, p. 154
Storage and Stability (1937)