Whether continence is a virtue?

Objections

Objection 1 : It would seem that continence is not a virtue. For species and genus are not co-ordinate members of the same division. But continence is co-ordinated with virtue, according to the Philosopher (Ethic. vii, 1,9). Therefore continence is not a virtue.
Objection 2 : Further, no one sins by using a virtue, since, according to Augustine (De Lib. Arb. ii, 18,19), "a virtue is a thing that no one makes ill use of." Yet one may sin by containing oneself: for instance, if one desire to do a good, and contain oneself from doing it. Therefore continence is not a virtue.
Objection 3 : Further, no virtue withdraws man from that which is lawful, but only from unlawful things: for a gloss on Gal. 5:23, "Faith, modesty," etc., says that by continence a man refrains even from things that are lawful. Therefore continence is not a virtue.