“The desire to tell the truth is only one condition for being an intellectual. The other is courage, readiness to carry on rational inquiry to wherever it may lead … to withstand … comfortable and lucrative conformity.”
"The Commitment of the Intellectual," in The Longer View (1969), p. 14
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Paul A. Baran 24
American Marxist economist 1909–1964Related quotes

An Old Chaos: Humanism and Flying Saucers (p. 81)
The Silence of Animals: On Progress and Other Modern Myths (2013)

“Action: the Perfection of Human Life,” Sewanee Review, LVI (Winter, 1948), pp. 3-4.

Introductory : The Problem
Progress and Poverty (1879)
Context: I propose in this inquiry to take nothing for granted, but to bring even accepted theories to the test of first principles, and should they not stand the test, freshly to interrogate facts in the endeavor to discover their law.
I propose to beg no question, to shrink from no conclusion, but to follow truth wherever it may lead. Upon us is the responsibility of seeking the law, for in the very heart of our civilization to-day women faint and little children moan. But what that law may prove to be is not our affair. If the conclusions that we reach run counter to our prejudices, let us not flinch; if they challenge institutions that have long been deemed wise and natural, let us not turn back.

Source: Daring Greatly: How the Courage to Be Vulnerable Transforms the Way We Live, Love, Parent, and Lead

Letter https://founders.archives.gov/documents/Jefferson/98-01-02-1712 to William Roscoe (27 December 1820)
1820s

As quoted by George H. W. Bush in remarks while presenting National Medals of Science and Technology http://bushlibrary.tamu.edu/research/papers/1990/90111300.html (13 November 1990). This might be a paraphrase of statements from his introduction to "Science The Endless Frontier" (1945), rather than a direct quote. (see below)

Preface to the Third Edition (August 1942)
The Mass Psychology of Fascism (1933)
Context: If, by being revolutionary, one means rational rebellion against intolerable social conditions, if, by being radical, one means "going to the root of things," the rational will to improve them, then fascism is never revolutionary. True, it may have the aspect of revolutionary emotions. But one would not call that physician revolutionary who proceeds against a disease with violent cursing but the other who quietly, courageously and conscientiously studies and fights the causes of the disease. Fascist rebelliousness always occurs where fear of the truth turns a revolutionary emotion into illusions.