At what is the narrator poking fun when he gives this example of Feliciano de Silva's "lucid prose style": "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."

The reason without reason.

Explanation:

Feliciano de Silva was a spanish writer from the 16th century with a rather bombastic style. No one less than the great Miguel de Cervantes made fun of him. He and other contemporary writers especially disliked the reasoning without reason (sin razón) that was so abundantly present in the works of de Silva.