Reply Obj. 2: Man's mind is drawn, on account of his affections, towards the things for which he has an affection, according to Matt. 6:21, "Where thy treasure is, there is thy heart also." And since man has special affection for those things which foster the flesh, it follows that man's thoughts are concerned about things that foster his flesh, so that man seeks to know how he may best sustain his body. Accordingly curiosity is accounted to be about things pertaining to the body by reason of things pertaining to knowledge.
Reply Obj. 3: Covetousness craves the acquisition of gain, and for this it is very necessary to be skilled in earthly things. Accordingly studiousness is ascribed to things pertaining to covetousness. _______________________
SECOND ARTICLE [II-II, Q. 166, Art. 2]
Whether Studiousness Is a Part of Temperance?
Objection 1: It would seem that studiousness is not a part of temperance. For a man is said to be studious by reason of his studiousness. Now all virtuous persons without exception are called studious according to the Philosopher, who frequently employs the term "studious" (spoudaios) in this sense (Ethic. ix, 4, 8, 9). [*In the same sense Aristotle says in Ethic. iii, 2, that "every vicious person is ignorant of what he ought to do.">[ Therefore studiousness is a general virtue, and not a part of temperance.
Obj. 2: Further, studiousness, as stated (A. 1), pertains to knowledge. But knowledge has no connection with the moral virtues which are in the appetitive part of the soul, and pertains rather to the intellectual virtues which are in the cognitive part: wherefore solicitude is an act of prudence as stated above (Q. 47, A. 9). Therefore studiousness is not a part of temperance.
Obj. 3: Further, a virtue that is ascribed as part of a principal virtue resembles the latter as to mode. Now studiousness does not resemble temperance as to mode, because temperance takes its name from being a kind of restraint, wherefore it is more opposed to the vice that is in excess: whereas studiousness is denominated from being the application of the mind to something, so that it would seem to be opposed to the vice that is in default, namely, neglect of study, rather than to the vice which is in excess, namely curiosity. wherefore, on account of its resemblance to the latter, Isidore says (Etym. x) that "a studious man is one who is curious to study." Therefore studiousness is not a part of temperance.
On the contrary, Augustine says (De Morib. Eccl. 21): "We are forbidden to be curious: and this is a great gift that temperance bestows." Now curiosity is prevented by moderate studiousness. Therefore studiousness is a part of temperance.
I answer that, As stated above (Q. 141, AA. 3, 4, 5), it belongs to temperance to moderate the movement of the appetite, lest it tend excessively to that which is desired naturally. Now just as in respect of his corporeal nature man naturally desires the pleasures of food and sex, so, in respect of his soul, he naturally desires to know something; thus the Philosopher observes at the beginning of his Metaphysics (i, 1): "All men have a natural desire for knowledge."
The moderation of this desire pertains to the virtue of studiousness; wherefore it follows that studiousness is a potential part of temperance, as a subordinate virtue annexed to a principal virtue. Moreover, it is comprised under modesty for the reason given above (Q. 160, A. 2).