“Some of her answers might excite popular prejudice, but if there is any principle of the Constitution that more imperatively calls for attachment than any other it is the principle of free thought—not free thought for those who agree with us but freedom for the thought that we hate.”
United States v. Schwimmer, 279 U.S. 644 (1929) (Holmes, J., dissenting).
1920s
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Oliver Wendell Holmes Jr. 107
United States Supreme Court justice 1841–1935Related quotes

Alabama Republican Assemblies Luncheon, April 29, 2000. http://renewamerica.us/archives/speeches/00_04_29alral.htm.
2000

Quoted in Linda O. McMurray, George Washington Carver: Scientist and Symbol (Oxford University Press, 1982), p. 107

“Those who are free of resentful thoughts surely find peace.”

“In a free state there should be freedom of speech and thought.”
In civitate libera linguam mentemque liberas esse debere (jactabat).
Variant translation: In a free state, both the tongue and the mind ought to be free.
From Suetonius, The Twelves Caesars, ch. 28

Variant: You could attach prices to ideas. Some cost a lot some little. … And how do you pay for ideas? I believe: with courage.
Source: Culture and Value (1980), p. 52e

Speech in Chicago, Illinois http://www.bartleby.com/251/1002.html (9 July 1858)
1850s

Diary entry (April 30, 1870) as quoted in Ralph Barton Perry, The Thought and Character of William James, vol. 1, p. 323; Letters of William James, vol. I, p. 147.
1870s