The three greatest fools of History have been Jesus Christ, Don Quixote... and me!
Variant: The three greatest dolts in the world: Jesus Christ, Don Quixote, and I.
Reportedly said to his physician in his final days, but not his last words. As quoted in: Our Lord Don Quixote: The Life of Don Quixote and Sancho, with Related Essays (1967) by Miguel de Unamuno, as translated by Anthony Kerrigan, p. 386