“It is a melancholy truth, that a suppression of the press could not more completely deprive the nation of its benefits, than is done by its abandoned prostitution to falsehood. Nothing can now be believed which is seen in a newspaper. Truth itself becomes suspicious by being put into that polluted vehicle. The real extent of this state of misinformation is known only to those who are in situations to confront facts within their knowledge with the lies of the day.”
Letter to John Norvell (11 June 1807). Original and transcript https://www.loc.gov/resource/mtj1.038_0592_0594/?sp=2&st=text
1800s, Second Presidential Administration (1805-1809)
Context: To your request of my opinion of the manner in which a newspaper should be conducted, so as to be most useful, I should answer, "by restraining it to true facts & sound principles only." Yet I fear such a paper would find few subscribers. It is a melancholy truth, that a suppression of the press could not more completely deprive the nation of its benefits, than is done by its abandoned prostitution to falsehood. Nothing can now be believed which is seen in a newspaper. Truth itself becomes suspicious by being put into that polluted vehicle. The real extent of this state of misinformation is known only to those who are in situations to confront facts within their knowledge with the lies of the day.... I will add, that the man who never looks into a newspaper is better informed than he who reads them; inasmuch as he who knows nothing is nearer to truth than he whose mind is filled with falsehoods & errors. He who reads nothing will still learn the great facts, and the details are all false.
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Thomas Jefferson 456
3rd President of the United States of America 1743–1826Related quotes

John F. Kennedy: "Remarks on the 20th Anniversary of the Voice of America" (26 February 1962) http://www.presidency.ucsb.edu/ws/index.php?pid=9075&st=&st1=<!-- Online by Gerhard Peters and John T. Woolley, The American Presidency Project -->
1962
Context: We welcome the views of others. We seek a free flow of information across national boundaries and oceans, across iron curtains and stone walls. We are not afraid to entrust the American people with unpleasant facts, foreign ideas, alien philosophies, and competitive values. For a nation that is afraid to let its people judge the truth and falsehood in an open market is a nation that is afraid of its people.

Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 603.

Source: 1930s, Power: A New Social Analysis (1938), Ch. 12: Powers and forms of governments

Lovell v. City of Griffin, 303 U.S. 444 (1938).
Judicial opinions

A Grief Observed (1961)
Context: You never know how much you really believe anything until its truth or falsehood becomes a matter of life and death to you. It is easy to you believe a rope to be strong and sound as long as you are merely using it to cord a box. But suppose that you had to hang by that rope over a precipice. Wouldn't you then first discover how much you really trusted it? … Only a real risk tests the reality of a belief.

“A very great deal more truth can become known than can be proven.”
"The Development of the Space-Time View of Quantum Electrodynamics," Nobel Lecture http://nobelprize.org/physics/laureates/1965/feynman-lecture.html (11 December 1965)

Describing a theory held by some that President George W. Bush knew about the 9-11 attack coming to America. The Diane Rehm Show, public radio station WAMU, December 1, 2003. Quoted by Timothy Noah, "Howard Dean: Whopper of the Week" http://www.slate.com/articles/news_and_politics/chatterbox/2003/12/whopper_howard_dean.html, December 13, 2003. Retrieved May 12, 2016.