Throughout both works Cervantes makes a nuisance of himself by constantly injecting himself and reminding the audience of the "truth- of his story.
Now Cervantes comes to explain the basis for the story. He explains that the character of Don Quixote de la Mancha was a well-read man. However, it is said the he read the wrong kinds of books. Rather than books that educate or enlighten, our hero reads chivalric romances, and these, the author says, have poisoned his mind. He uses a couple specific examples of the gibberish that confused the great man, he writes.
Of all those that he thus devoured none pleased him so well as especially when he came to read those tales of love and amorous challenges for example: "The reason of the unreason that afflicts my reason, in such a manner weakens my reason that I with reason lament me of your comeliness."" And he was similarly affected when his eyes fell upon such lines as these: " the high Heaven of your divinity divinely fortifies you with the stars and renders you deserving of that desert your greatness doth deserve.""(Page 1182).
After reading such lines, it is easy to understand, to this student at least, how Sr. Quejana may have become confused. However, the probability of this causing insanity is slim at best, this is, perchance, the earliest recorded case of someone's blaming the entertainment industry for affecting people negatively. Cervantes goes on in his book, to explain how Senor Quejana, having become so absorbed by these tales that he no longer can determine where reality ends and fiction begins, takes upon himself the title of Don Quixote de la Mancha (which simply means Sir Quixote from the town of la Mancha) and designs himself a life of a knight-errant. Again, this would appear to be an example of a purely satirical point, as opposed to a moral position.
As the tale progresses there is shown to the audience, instances where the hero lapses in and out of rationality, but comically, never seems to pick the right thought process.