“All intellectual tendencies are corrupted when they consort with power.”
“Nothing, in truth, has such a tendency to weaken not only the powers of invention, but the intellectual powers in general, as a habit of extensive and various reading without reflection.”
Source: Elements of the Philosophy of the Human Mind, 1792, p. 334 (in 1829 edition https://books.google.nl/books?id=VxtSAAAAMAAJ)
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Dugald Stewart 6
Scottish philosopher and mathematician 1753–1828Related quotes

Source: The Crisis of the Modern World (1927), pp. 97-98

Zeit Online http://www.zeit.de/online/2008/30/schmidt-atomausstieg-spd, 23. July 2008

An Old Man's Thoughts on Many Things, Of Education I
Introduction : The Libertarian Tradition
Communalism (1974)
Context: The contemporary world is being pulled apart by two contrary tendencies — one toward social death, one toward the birth of a new society. Many of the phenomena of the present crisis are ambivalent and can either mean death or birth depending on how the crisis is resolved.
The crisis of a civilization is a mass phenomenon and moves onward without benefit of ideology. The demand for freedom, community, life significance, the attack on alienation, is largely inchoate and instinctive. In the libertarian revolutionary movement these objectives were ideological, confined to books, or realized with difficulty, usually only temporarily in small experimental communities, or in individual lives and tiny social circles. It has been said of the contemporary revolutionary wave that it is a revolution without theory, anti-ideological. But the theory, the ideology, already exists in a tradition as old as capitalism itself. Furthermore, just as individuals specially gifted have been able to live free lives in the interstices of an exploitative, competitive system, so in periods when the developing capitalist system has temporarily and locally broken down due to the drag of outworn forms there have existed brief revolutionary honeymoons in which freer communal organization has prevailed. Whenever the power structure falters or fails the general tendency is to replace it with free communism. This is almost a law of revolution. In every instance so far, either the old power structure, as in the Paris Commune or the Spanish Civil War, or a new one, as in the French and Bolshevik Revolutions, has suppressed these free revolutionary societies with wholesale terror and bloodshed.

The Natural History of Intellect (1893)

“There is nothing so powerful as truth — and often nothing so strange.”
Argument on the murder of Captain White (1830)

Random Thoughts http://townhall.com/columnists/thomassowell/2004/02/25/random_thoughts/page/full, Feb 25, 2004
2000s

“Power concedes nothing without a demand.”
Variant: Power concedes nothing without a demand. It never did and it never will.

“Power without a nation's confidence is nothing.”
As quoted in And I Quote : The Definitive Collection of Quotes, Sayings, and Jokes for the Contemporary Speechmaker (1992) by Ashton Applewhite, Tripp Evans, and Andrew Frothingham, p. 278