Whether penance is the first of the virtues?

Objections

Objection 1 : It would seem that penance is the first of the virtues. Because, on Mt. 3:2, "Do penance," etc., a gloss says: "The first virtue is to destroy the old man, and hate sin by means of penance."
Objection 2 : Further, withdrawal from one extreme seems to precede approach to the other. Now all the other virtues seem to regard approach to a term, because they all direct man to do good; whereas penance seems to direct him to withdraw from evil. Therefore it seems that penance precedes all the other virtues.
Objection 3 : Further, before penance, there is sin in the soul. Now no virtue is compatible with sin in the soul. Therefore no virtue precedes penance, which is itself the first of all and opens the door to the others by expelling sin.