Whether sins that have been forgiven, return through ingratitude which is shown especially in four kinds of sin?

❌ Objection 1 : It would seem that sins do not return through ingratitude, which is shown especially in four kinds of sin, viz., hatred of one's neighbor, apostasy from faith, contempt of confession and regret for past repentance, and which have been expressed in the following verse:"Fratres odit, apostata fit, spernitque, fateri,Poenituisse piget, pristina culpa redit." For the more grievous the sin committed against God after one has received the grace of pardon, the greater the ingratitude. But there are sins more grievous than these, such as blasphemy against God, and the sin against the Holy Ghost. Therefore it seems that sins already pardoned do not return through ingratitude as manifested in these sins, any more than as shown in other sins.

❌ Objection 2 : Further, Rabanus says: "God delivered the wicked servant to the torturers, until he should pay the whole debt, because a man will be deemed punishable not only for the sins he commits after Baptism, but also for original sin which was taken away when he was baptized." Now venial sins are reckoned among our debts, since we pray in their regard: "Forgive us our trespasses [debita]." Therefore they too return through ingratitude; and, in like manner seemingly, sins already pardoned return through venial sins, and not only through those sins mentioned above.

❌ Objection 3 : Further, ingratitude is all the greater, according as one sins after receiving a greater favor. Now innocence whereby one avoids sin is a Divine favor, for Augustine says (Confess. ii): "Whatever sins I have avoided committing, I owe it to Thy grace." Now innocence is a greater gift, than even the forgiveness of all sins. Therefore the first sin committed after innocence is no less an ingratitude to God, than a sin committed after repentance, so that seemingly ingratitude in respect of the aforesaid sins is not the chief cause of sins returning.