“To be ignorant is not the special prerogative of man; to know that he is ignorant is his special privilege.”

Source: City of Glass

Source: My Life and Work (1922), p. 10

But it is totally irresponsible to have a loud and vociferous opinion on economic subjects while remaining in this state of ignorance.
The Death Wish of the Anarcho-Communists (1970) http://www.lewrockwell.com/rothbard/rothbard122.html.

The Debs Decision https://ia902703.us.archive.org/33/items/TheDebsDecision/Debs.htm (1919)
Context: Compared with the necessity of protecting ruling class privileges and prerogatives, the right of a man to express his mind goes for nothing. That is the lesson of history and that is what we are witnessing today. Men who have stirred up the people; men who have raised their voices in protest; men who thought straight; men who have loved their fellow men too much; men who have had conviction and courage and purpose; men who were willing to stick by their ideals—such men have suffered in every age.

Source: To Kill a Mockingbird

Not attribution to Jefferson earlier than William Jennings Bryan's Baltimore address of January 20, 1900
California Digital Newspaper Collection, Los Angeles Herald http://cdnc.ucr.edu/cgi-bin/cdnc?a=d&d=LAH19000121.2.94.; appears in proximity to a reference to Jefferson in the 1878 "Notes of a Voyage to California Via Cape Horn", reprinting a 1850 Sacramento advertisment
via Google Books http://books.google.com/books?id=Cis3Ni8wJkgC&pg=PA280 Samuel Curtis Upham, "Notes of a Voyage to California Via Cape Horn: Together with Scenes in El Dorado, in the Year 1849-'50, with an Appendix Containing Reminiscences: Together with the Articles of Association and Roll of Members of "The Associated Pioneers of the Territorial Days of California".. Earliest known variant is from the August 31, 1844 issue of "Niles' National Register", authored by the committee of William C. Bryant, George P. Barker, John W. Edmonds, David Dudley Field, Theodore Sedgwick, Thomas W. Tucker, and Isaac Townsend.
via Google Books http://books.google.com/books?id=M1oUAAAAYAAJ&pg=PA438.
Misattributed

Gene, on war.
Source: A Separate Peace (1959), P. 193

Hush Don't Say Anything to God (1999)
Context: This is a gathering of Lovers.
In this gathering
there is no high, no low,
no smart, no ignorant,
no special assembly,
no grand discourse,
no proper schooling required.
There is no master,
no disciple.
This gathering is more like a drunken party,
full of tricksters, fools,
mad men and mad women.
This is a gathering of Lovers.

The Death Wish of the Anarcho-Communists (1970) http://www.lewrockwell.com/rothbard/rothbard122.html.