Three-fourths of the mistakes a man makes are made because he does not really know what he thinks he knows.
Source: In The Speaker's Electronic Reference Collection, AApex Software, 1994.
-- James Bryce, (May 10 1838-1922), English diplomat, author; He was ambassador to the U.S. 1907-13; wrote classics Holy Roman Empire, 1864; American Commonwealth, 1888.