Many Catholics use the term "mortal sin" to mean “grave sin”. I probably did this myself before I joined this forum and a couple of posters including a priest gave me the standard speech about how we cannot know that someone else’s sin is mortal or not and that furthermore it’s probably not mortal because free will appeared to be missing, etc.
grave and mortal are synonymous.
AND
we CAN see when a person commits a
mortal vs non mortal sin
it’s no big mystery to John or he wouldn’t have taught what he did
AND
Obviously if one wants forgiveness of mortal sin, the Church teaches we need confession and absolution.
Tos_Bearself:
We would do well to just focus on sin and not be constantly trying to separate out mortal sin as the only sin we need to be concerned about. When God judges, he’s going to show you ALL your sins. NOT just your grave sins.
Mortal sin is a cinch to commit.
If one dies in sin therefore,
Since
venial sin won’t send one to hell., but Mortal sin will, then we need to remain focused particularly in avoiding mortal sin. There will be no discussion at judgement. If one dies in mortal sin they go immediately to hell
1035 The teaching of the Church affirms the existence of hell and its eternity. Immediately after death the souls of those who die in a state of mortal sin descend into hell, where they suffer the punishments of hell, “eternal fire.” The chief punishment of hell is eternal separation from God, in whom alone man can possess the life and happiness for which he was created and for which he longs.
This is why we have distinction of sin, (it’s scriptural) and it’s why mortal sin is to be avoided at all cost.
BTW, Georgetown Univ, a Catholic Univ, did a study on mass attendance. In 2018, they found only 21% of Catholics went faithfully to mass on Sunday. Meaning, unless one had a good excuse, all the other Catholics are in mortal sin. And if they don’t go to reconciliation before their next reception of the Eucharist, they commit sacrilege on top of their mortal sin.
2181 The Sunday Eucharist is the foundation and confirmation of all Christian practice. For this reason the faithful are obliged to participate in the Eucharist on days of obligation, unless excused for a serious reason (for example, illness, the care of infants) or dispensed by their own
pastor. Those who deliberately fail in this obligation commit a grave sin.
BTW: Grave sin = mortal sin, A distinction without a difference
What the Early Church Believed: Mortal Sin | Catholic Answers grave sin and mortal sin (deadly) are synonymous. I.E. If one is in grave sin, they are dead spiritually.