"A fanatic is one who can't change his mind and won't change the subject."
Sir Winston Churchill, quoted in New York Times

"There is no strong performance without a little fanaticism in the performer."
Ralph Waldo Emerson, Journals

"Fanatics have their dreams, wherewith they weave. A paradise for a sect."
John Keats, The Fall of Hyperion, Bk i. 1