Whether the sacrament of Penance may be repeated?

Objections

Objection 1 : It would seem that the sacrament of Penance should not be repeated. For the Apostle says (Heb. 6:4, seqq.): "It is impossible for those, who were once illuminated, have tasted also the heavenly gift, and were made partakers of the Holy Ghost . . . and are fallen away, to be renewed again to penance." Now whosoever have done penance, have been illuminated, and have received the gift of the Holy Ghost. Therefore whosoever sin after doing penance, cannot do penance again.
Objection 2 : Further, Ambrose says (De Poenit. ii): "Some are to be found who think they ought often to do penance, who take liberties with Christ: for if they were truly penitent, they would not think of doing penance over again, since there is but one Penance even as there is but one Baptism." Now Baptism is not repeated. Neither, therefore, is Penance to be repeated.
Objection 3 : Further, the miracles whereby our Lord healed bodily diseases, signify the healing of spiritual diseases, whereby men are delivered from sins. Now we do not read that our Lord restored the sight to any blind man twice, or that He cleansed any leper twice, or twice raised any dead man to life. Therefore it seems that He does not twice grant pardon to any sinner.
Objection 4 : Further, Gregory says (Hom. xxxiv in Evang.): "Penance consists in deploring past sins, and in not committing again those we have deplored": and Isidore says (De Summo Bono ii): "He is a mocker and no penitent who still does what he has repented of." If, therefore, a man is truly penitent, he will not sin again. Therefore Penance cannot be repeated.
Objection 5 : Further, just as Baptism derives its efficacy from the Passion of Christ, so does Penance. Now Baptism is not repeated, on account of the unity of Christ's Passion and death. Therefore in like manner Penance is not repeated.
Objection 6 : Further, Ambrose says on Ps. 118:58, "I entreated Thy face," etc., that "facility of obtaining pardon is an incentive to sin." If, therefore, God frequently grants pardon through Penance, it seems that He affords man an incentive to sin, and thus He seems to take pleasure in sin, which is contrary to His goodness. Therefore Penance cannot be repeated.