All 7 Uses of

sagacious
in
Don Quixote

I say, too, that when a painter desires to become famous in his art he endeavours to copy the originals of the rarest painters that he knows; and the same rule holds good for all the most important crafts and callings that serve to adorn a state; thus must he who would be esteemed prudent and patient imitate Ulysses, in whose person and labours Homer presents to us a lively picture of prudence and patience; as Virgil, too, shows us in the person of AEneas the virtue of a pious son and the sagacity of a brave and skilful captain; not representing or describing them as they were, but as they ought to be, so as to leave the example of their virtues to posterity.†
Chpt 1.25-26

sagacity = wisdom

showing him sagacious in foreseeing the wiles of the enemy
Chpt 1.47-48 *

sagacious = wise

"May I be buried with you, Sancho," said the duke, "but you know everything; I hope you will make as good a governor as your sagacity promises; and that is all I have to say; and now remember to-morrow is the day you must set out for the government of the island, and this evening they will provide you with the proper attire for you to wear, and all things requisite for your departure."†
Chpt 2.41-42

sagacity = wisdom

and thus, by prudence, sagacity, care and the fear he inspires, he has borne on his mighty shoulders the weight of this great policy and carried it into effect, all our schemes and plots, importunities and wiles, being ineffectual to blind his Argus eyes, ever on the watch lest one of us should remain behind in concealment, and like a hidden root come in course of time to sprout and bear poisonous fruit in Spain, now cleansed, and relieved of the fear in which our vast numbers kept it.†
Chpt 2.65-66

The busy and sagacious bees fixed their republic in the clefts of the rocks and hollows of the trees, offering without usance the plenteous produce of their fragrant toil to every hand.†
Chpt 1.11-12

Here Cardenio brought to a close his long discourse and story, as full of misfortune as it was of love; but just as the curate was going to address some words of comfort to him, he was stopped by a voice that reached his ear, saying in melancholy tones what will be told in the Fourth Part of this narrative; for at this point the sage and sagacious historian, Cide Hamete Benengeli, brought the Third to a conclusion.†
Chpt 1.27-28

and so they followed the same route Don Quixote took, and almost came up with him in time to be present at the adventure of the cart of Death and finally encountered them in the grove, where all that the sagacious reader has been reading about took place;†
Chpt 2.15-16

Definition:

wise -- especially through long experience and thoughtfulness