Whether human virtue is a habit?

Objections

Objection 1 : It would seem that human virtue is not a habit: For virtue is "the limit of power" (De Coelo i, text. 116). But the limit of anything is reducible to the genus of that of which it is the limit; as a point is reducible to the genus of line. Therefore virtue is reducible to the genus of power, and not to the genus of habit.
Objection 2 : Further, Augustine says (De Lib. Arb. ii) [*Retract. ix; cf. De Lib. Arb. ii, 19] that "virtue is good use of free-will." But use of free-will is an act. Therefore virtue is not a habit, but an act.
Objection 3 : Further, we do not merit by our habits, but by our actions: otherwise a man would merit continually, even while asleep. But we do merit by our virtues. Therefore virtues are not habits, but acts.
Objection 4 : Further, Augustine says (De Moribus Eccl. xv) that "virtue is the order of love," and (Questions. lxxxiii, qu. 30) that "the ordering which is called virtue consists in enjoying what we ought to enjoy, and using what we ought to use." Now order, or ordering, denominates either an action or a relation. Therefore virtue is not a habit, but an action or a relation.
Objection 5 : Further, just as there are human virtues, so are there natural virtues. But natural virtues are not habits, but powers. Neither therefore are human virtues habits.