“A professor is one who talks in someone else's sleep.”
Often attributed to Auden, but he was repeating an anonymous joke; he did not claim to have originated it. See "Who Wrote Auden's Definition of a Professor?" http://www.audensociety.org/definition.html
Misattributed
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W. H. Auden 122
Anglo-American poet 1907–1973Related quotes

“It's you who are strange. Talking to you is like talking to someone who has no shadow.”
Jórunn
Heimsljós (World Light) (1940), Book Three: The House of the Poet

“There's no one so self-righteous as someone policing someone else's morality.”
Musings of Anita Blake; p. 627
Anita Blake: Vampire Hunter series, Incubus Dreams (2004)

“Wanting to be someone else is a waste of who you are”
Variant: Wanting to be someone else is the waste of who you are
“One must be ruthless with one’s own writing or someone else will be.”

Source: Das Gewicht der Welt [The Weight of the World], p. 9