“I have a very simple question to people … who seem to suffer from excessive narcissism: please name three other persons who are smarter and more capable than you, in the field you work in.”
In most cases they are utterly unable to answer that question honestly.
A comment http://lwn.net/Articles/447204/ at LWN.net in 2011.
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Ingo Molnar 3
Linux kernel programmerRelated quotes

“Always be smarter than the people who hire you.”
Quoted from T.P. Hughes: Dictionary of Islam, p.314, who refers to book 13 of Mishkatu'l Masabih ("niches for lamps [of the tradition]", a compilation of Sunni traditions by the 12th-century Imam Husain al-Baghawi, expanded in the 14th century by Shaykh Waliuddin). Also quoted Elst, Koenraad. (1997) The Demographic Siege
Dictionary of Islam

Statement http://www.ur.ku.edu/News/04N/MayNews/May28/transcript.html (May 21, 2004)
2000s

Age and Guile Beat Youth, Innocence, and a Bad Haircut (2005)

Victor Weisskopf to J. Howard McMillen, 14 Mar 1960, also as quoted by [David Kaiser, Drawing theories apart: the dispersion of Feynman diagrams in postwar physics, University of Chicago Press, 2005, 0226422674, 336]