“A critic is a man who knows the way but can't drive the car.”
As quoted in "Critic Kenneth Tynan Has Mellowed But Is Still England's Stingingest Gadfly" by Godfrey Smith in The New York Times (9 January 1966)
Variant: A critic is a man who know the way, but can not drive a car.
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Kenneth Tynan 40
English theatre critic and writer 1927–1980Related quotes

“A zebra can't drive a moon-buggy. Or any other sort of car for that matter.”
Sam, in Bad Day on the Moon
Sam and Max comics

Author Unknown, Chi Cubs 4, Houston 1 http://sports.yahoo.com/mlb/recap?gid=260720116, Yahoo! Sports, Retrieved on June 16, 2007
2006

[NewsBank, Nye: We must all save the Earth, The Madison Courier, Madison, Indiana, February 21, 2009, Pat Whitney]

As quoted in A Fate Worse than Debt (1988) Susan George.
Attributions

Steve Jobs, Playboy, Feb 1985, by Philip Elmer-Dewitt, “Steve-Jobs The Playboy Interview” http://fortune.com/2010/11/20/steve-jobs-the-playboy-interview/, Fortune.com, November 20, 2010.
1980s