Before revision: In psychology and philosophy Psychologist George Humphrey referred to the tale in his 1923 book The Story of Man's Mind: "No man skilled at a trade needs to put his constant attention on the routine work", he wrote.
After revision: In psychology and philosophy English psychologist George Humphrey (1889–1966) referred to the tale in his 1923 book The Story of Man's Mind: "No man skilled at a trade needs to put his constant attention on the routine work", he wrote.