Whether Penance should last till the end of life?

Objections

Objection 1 : It would seem that Penance should not last till the end of life. Because Penance is ordained for the blotting out of sin. Now the penitent receives forgiveness of his sins at once, according to Ezech. 18:21: "If the wicked do penance for all his sins which he hath committed . . . he shall live and shall not die." Therefore there is no need for Penance to be further prolonged.
Objection 2 : Further, Penance belongs to the state of beginners. But man ought to advance from that state to the state of the proficient, and, from this, on to the state of the perfect. Therefore man need not do Penance till the end of his life.
Objection 3 : Further, man is bound to observe the laws of the Church in this as in the other sacraments. But the duration of repentance is fixed by the canons, so that, to wit, for such and such a sin one is bound to do penance for so many years. Therefore it seems that Penance should not be prolonged till the end of life.