I answer that, We must draw a distinction between the damned before the judgment day and after. For all are agreed that after the judgment day there will be neither merit nor demerit. The reason for this is because merit or demerit is directed to the attainment of some further good or evil: and after the day of judgment good and evil will have reached their ultimate consummation, so that there will be no further addition to good or evil. Consequently, good will in the blessed will not be a merit but a reward, and evil will in the damned will be not a demerit but a punishment only. For works of virtue belong especially to the state of happiness and their contraries to the state of unhappiness (Ethic. i, 9,10).
On the other hand, some say that, before the judgment day, both the good merit and the damned demerit. But this cannot apply to the essential reward or to the principal punishment, since in this respect both have reached the term. Possibly, however, this may apply to the accidental reward, or secondary punishment, which are subject to increase until the day of judgment. Especially may this apply to the demons, or to the good angels, by whose activities some are drawn to salvation, whereby the joy of the blessed angels is increased, and some to damnation, whereby the punishment of the demons is augmented [*Cf. FP, Question [62], Article [9], ad 3; SS, Question [13], Article [4], ad 2; where St. Thomas tacitly retracts the opinion expressed here as to merit or demerit.].