Whether the virtues are restored through Penance?

Objections

Objection 1 : It would seem that the virtues are not restored through penance. Because lost virtue cannot be restored by penance, unless penance be the cause of virtue. But, since penance is itself a virtue, it cannot be the cause of all the virtues, and all the more, since some virtues naturally precede penance, viz., faith, hope, and charity, as stated above (Question [85], Article [6]). Therefore the virtues are not restored through penance.
Objection 2 : Further, Penance consists in certain acts of the penitent. But the gratuitous virtues are not caused through any act of ours: for Augustine says (De Lib. Arb. ii, 18: In Ps. 118) that "God forms the virtues in us without us." Therefore it seems that the virtues are not restored through Penance.
Objection 3 : Further, he that has virtue performs works of virtue with ease and pleasure: wherefore the Philosopher says (Ethic. i, 8) that "a man is not just if he does not rejoice in just deeds." Now many penitents find difficulty in performing deeds of virtue. Therefore the virtues are not restored through Penance.