Whether the ingratitude whereby a subsequent sin causes the return of previous sins, is a special sin?

❌ Objection 1 : It would seem that the ingratitude, whereby a subsequent sin causes the return of sins previously forgiven, is a special sin. For the giving of thanks belongs to counterpassion which is a necessary condition of justice, as the Philosopher shows (Ethic. v, 5). But justice is a special virtue. Therefore this ingratitude is a special sin.

❌ Objection 2 : Further, Tully says (De Inv. Rhet. ii) that thanksgiving is a special virtue. But ingratitude is opposed to thanksgiving. Therefore ingratitude is a special sin.

❌ Objection 3 : Further, a special effect proceeds from a special cause. Now ingratitude has a special effect, viz. the return, after a fashion, of sins already forgiven. Therefore ingratitude is a special sin.