Miguel de Cervantes Quotes about Doubt

There is no greater folly in the world than for a man to despair.
Miguel de Cervantes Saavedra (1855). “The History of Don Quixote de la Mancha: With Illus. by Schoff”, p.384
Miguel de Cervantes Saavedra (1950). “The adventures of Don Quixote”, Penguin Classics