Samuel Putnam

“The pretense, the fiction (for it is scarcely more than that) of an attack on the books of chivalry is kept up throughout; but as the story develops and deepens beyond the author's expectations as well as those of the reader, Don Quixote becomes nothing less than a novelistic treatment of the essential nature of human life and man's greatest metaphysical problem: that of illusion and reality. It is a problem as old as Plato-and a good deal older- and as new as Jean-Paul Sartre. It is one that, as Lionel Trilling has rightly observed, has always been the serious novelist's chief concern. In this light, there can no longer be any question as to Don Quixote's "madness" in the ordinary acceptation of that term. In Waldo Frank's finely expressive phrase, he is "a man possessed, not a madman.”
― Samuel Putnam, Don Quixote