In Miguel de Cervantes Saavedra's "Don Quixote," the protagonist experiences a mental breakdown that leads him to embark on a fanciful quest. Believing it essential for his honor and the good of his country, he decides to become a knight-errant. This decision stems from his obsession with chivalric romances, which alters his perception of reality.

His misguided determination drives him to seek adventure and prove himself as a heroic figure. With a warped sense of duty, Don Quixote sets out to revive the ideals of knighthood, often resulting in absurd and humorous situations. His journey reflects both his personal delusions and a broader commentary on the nature of reality and honor in society.