Don Quixote is characterized as a man who gave himself up to madness and the illusion created by over-reading chivalry novels.
We can arrive at this answer because:
With this, the reader realizes that Don Quixote's main conflict is with himself, as he cannot get rid of the illusion that he created himself. This allows the reader to understand Don Quixote's sensitivity and the dissatisfaction he felt with the real world and the way he lived.
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