Now the effect of virtuous works, which are done in charity, is to bring man to eternal life; and this is hindered by a subsequent mortal sin, inasmuch as it takes away grace. Wherefore deeds done in charity are said to be deadened by a subsequent mortal sin.
Reply Obj. 1: Just as sinful deeds pass as to the act but remain as to guilt, so deeds done in charity, after passing, as to the act, remain as to merit, in so far as they are acceptable to God. It is in this respect that they are deadened, inasmuch as man is hindered from receiving his reward.
Reply Obj. 2: There is no injustice in withdrawing the reward from him who has deserved it, if he has made himself unworthy by his subsequent fault, since at times a man justly forfeits through his own fault, even that which he has already received.
Reply Obj. 3: It is not on account of the strength of sinful deeds that deeds, previously done in charity, are deadened, but on account of the freedom of the will which can be turned away from good to evil. _______________________
FIFTH ARTICLE [III, Q. 86, Art. 5]
Whether Deeds Deadened by Sin, Are Revived by Penance?
Objection 1: It would seem that deeds deadened by sin are not revived by Penance. Because just as past sins are remitted by subsequent Penance, so are deeds previously done in charity, deadened by subsequent sin. But sins remitted by Penance do not return, as stated above (Q. 88, AA. 1, 2). Therefore it seems that neither are dead deeds revived by charity.
Obj. 2: Further, deeds are said to be deadened by comparison with animals who die, as stated above (A. 4). But a dead animal cannot be revived. Therefore neither can dead works be revived by Penance.
Obj. 3: Further, deeds done in charity are deserving of glory according to the quantity of grace or charity. But sometimes man arises through Penance to lesser grace or charity. Therefore he does not receive glory according to the merit of his previous works; so that it seems that deeds deadened by sin are not revived.
On the contrary, on Joel 2:25, "I will restore to you the years, which the locust . . . hath eaten," a gloss says: "I will not suffer to perish the fruit which you lost when your soul was disturbed." But this fruit is the merit of good works which was lost through sin. Therefore meritorious deeds done before are revived by Penance.