"Ah, but Senor!" exclaimed the niece, "your Grace should send them to be burned along with the rest; for I shouldn't wonder at all if my uncle, after… - Miguel de Cervantes

What is more dangerous than to become a poet? which is, as some say, an incurable and infectious disease.

"Oh Senor" said the niece. "Your grace should send them to be burned (books), just like all the rest, because it's very likely that my dear uncle, having been cured of the chivalric disease, will read these and want to become a shepherd and wander through the woods and meadows singing and playing and, what would be even worse, become a poet, and that, they say, is an incurable and contagious disease."

"Ah, senor!" said the niece, "your worship had better order these to be burned as well as the others; for it would be no wonder if, after being cured of his chivalry disorder, my uncle, by reading these, took a fancy to turn shepherd and range the woods and fields singing and piping; or, what would be still worse, to turn poet, which they say is an incurable and infectious malady."

Don Quixote is so crazy that he is sure no author could have invented him

Never stand begging for that which you have the power to earn.

And yet he esteemed himself fortunate, as it seemed to him that this was a regular knight-errant's mishap, and entirely, he considered, the fault of his horse.