We come now to the consideration of habits specifically. And since habits, as we have said (Q, A), are divided into good and bad, we must speak in the first place of good habits, which are virtues, and of other matters connected with them, namely the Gifts, Beatitudes and Fruits; in the second place, of bad habits, namely of vices and sins. Now five things must be considered about virtues: (1) the essence of virtue; (2) its subject; (3) the division of virtue; (4) the cause of virtue; (5) certain properties of virtue.
Under the first head, there are four points of inquiry:
(1) Whether human virtue is a habit?
(2) Whether it is an operative habit?
(3) Whether it is a good habit?
(4) Of the definition of virtue.