All 5 Uses of

sagacious
in
The Count of Monte Cristo

Morcerf asked leave to retire; he had to collect the documents he had long been preparing against this storm, which his sagacity had foreseen.
Chpt 85-86 *

sagacity = wisdom

Now, Madame Danglars feared Eugenie's sagacity and the influence of Mademoiselle d'Armilly; she had frequently observed the contemptuous expression with which her daughter looked upon Debray,—an expression which seemed to imply that she understood all her mother's amorous and pecuniary relationships with the intimate secretary; moreover, she saw that Eugenie detested Debray,—not only because he was a source of dissension and scandal under the paternal roof, but because she had at once classed him in that catalogue of bipeds whom Plato endeavors to withdraw from the appellation of men, and whom Diogenes designated as animals upon two legs without feathers.†
Chpt 99-100

The count's marvellous sagacity understood all that was passing in the young girl's mind.†
Chpt 99-100

, was carelessly listening to a man of fifty or fifty-two years of age, with gray hair, aristocratic bearing, and exceedingly gentlemanly attire, and meanwhile making a marginal note in a volume of Gryphius's rather inaccurate, but much sought-after, edition of Horace—a work which was much indebted to the sagacious observations of the philosophical monarch.†
Chpt 9-10

Faria, since their first acquaintance, had been on all points so rational and logical, so wonderfully sagacious, in fact, that he could not understand how so much wisdom on all points could be allied with madness.†
Chpt 17-18

Definition:

wise -- especially through long experience and thoughtfulness