Whether a mortal sin can become venial?

❌ Objection 1 : It would seem that a mortal sin can become venial. Because venial sin is equally distant from mortal, as mortal sin is from venial. But a venial sin can become mortal, as stated above (Article [5]). Therefore also a mortal sin can become venial.

❌ Objection 2 : Further, venial and mortal sin are said to differ in this, that he who sins mortally loves a creature more than God, while he who sins venially loves the creature less than God. Now it may happen that a person in committing a sin generically mortal, loves a creature less than God; for instance, if anyone being ignorant that simple fornication is a mortal sin, and contrary to the love of God, commits the sin of fornication, yet so as to be ready, for the love of God, to refrain from that sin if he knew that by committing it he was acting counter to the love of God. Therefore his will be a venial sin; and accordingly a mortal sin can become venial.

❌ Objection 3 : Further, as stated above (Article [5], Objection [3]), good is more distant from evil, than venial from mortal sin. But an act which is evil in itself, can become good; thus to kill a man may be an act of justice, as when a judge condemns a thief to death. Much more therefore can a mortal sin become venial.