The History of Don Quixote, Volume 2, Part 21

It follows the adventures of Alonso Quixano, an hidalgo who reads so many chivalric novels that he decides to set out to revive chivalry, under the name Don Quixote. Dejected beyond measure did Don Quixote pursue his journey, turning over in his mind the cruel trick the enchanters had played him in changing his lady Dulcinea into the vile shape of the village lass, nor could he think of any way of restoring her to her original form; and these reflections so absorbed him, that without being aware of it he let go Rocinante's bridle, and he, perceiving the liberty that was granted him, stopped at every step to crop the fresh grass with which the plain abounded.