Answer and Explanation:
At the beginning of the story we can see that Don Quixote became so addicted to chivalry stories that he completely lost track of reality, abandoning all his hobbies and obligations. He even went so far as to sell the properties he had to buy more books with a history of chivalry, finally succumbing to this universe of these stories. In other words, at the beginning of the story, we can see how Don Quixote went completely mad, through the influencing power of literature.