“He who thinks he knows, doesn't know. He who knows that he doesn't know, knows.”
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Joseph Campbell 140
American mythologist, writer and lecturer 1904–1987Related quotes

Source: How to Read a Book: The Classic Guide to Intelligent Reading

Quoted by Maya Angelou (quote reproduced in James L. Conyers, Andrew P. Smallwood, Malcolm X: A Historical Reader, Carolina Academic Press, 2008, p. 181 and Elaine Slivinski Lisandrelli, Maya Angelou: More than a poet, Enslow Publishers, 1996, p. 90)
Attributed

“He knows nothing; and he thinks he knows everything. That points clearly to a political career.”
Source: 1900s, Major Barbara (1905)

As quoted in The Works of the Emperor Julian (1923) by Wilmer Cave France Wright, p. 91
General sources

Associated Press (December 16, 1999) "Christopher Walken Prefers His Ozzie Nelson Side", The Press of Atlantic City, p. B3.