ted in _Ethic._ vi,
3, they are not intellectual virtues.
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THIRD ARTICLE [I-II, Q. 57, Art. 3]

Whether the Intellectual Habit, Art, Is a Virtue?

Objection 1: It would seem that art is not an intellectual virtue.
For Augustine says (De Lib. Arb. ii, 18, 19) that "no one makes bad
use of virtue." But one may make bad use of art: for a craftsman can
work badly according to the knowledge of his art. Therefore art is
not a virtue.

Obj. 2: Further, there is no virtue of a virtue. But "there is a
virtue of art," according to the Philosopher (Ethic. vi, 5).
Therefore art is not a virtue.

Obj. 3: Further, the liberal arts excel the mechanical arts. But just
as the mechanical arts are practical, so the liberal arts are
speculative. Therefore, if art were an intellectual virtue, it would
have to be reckoned among the speculative virtues.

_On the contrary,_ The Philosopher (Ethic. vi, 3, 4) says that art is
a virtue; and yet he does not reckon it among the speculative
virtues, which, according to him, reside in the scientific part of
the soul.

_I answer that,_ Art is nothing else but "the right reason about
certain works to be made." And yet the good of these things depends,
not on man's appetitive faculty being affected in this or that way,
but on the goodness of the work done. For a craftsman, as such, is
commendable, not for the will with which he does a work, but for the
quality of the work. Art, therefore, properly speaking, is an
operative habit. And yet it has something in common with the
speculative habits: since the quality of the object considered by the
latter is a matter of concern to them also, but not how the human
appetite may be affected towards that object. For as long as the
geometrician demonstrates the truth, it matters not how his
appetitive faculty may be affected, whether he be joyful or angry:
even as neither does this matter in a craftsman, as we have observed.
And so art has the nature of a virtue in the same way as the
speculative habits, in so far, to wit, as neither art nor speculative
habit makes a good work as regards the use of the habit, which is the
property of a virtue that perfects the appetite, but only as regards
the aptness to work well.

Reply Obj. 1: When anyone endowed with an art produces bad
workmanship, this is not the work of that art, in fact it is contrary
to the art: even as when a man lies, while knowing the truth, his
words are not in acc