[quote="ChildOfTheLight, post:1, topic:337369"]
So I know what the catechism says regarding mortal sin, and I know that you do not commit a mortal sin if you honestly don't know something is sinful.
My question is, what if you judge that something is not grave matter, and was thus, a venial sin, when in actuality the matter was grave.
For example, I know that lies can be of different gravity, but if I tell one anyway saying, it is just a white lie, not grave, but the lie was actually more severe, have I met the requirements for mortal sin? Or say I had been very poorly catechized and grew up thinking missing Sunday mass was not grave matter, but still a little wrong.
I ask because some people seem to think you only need to know the sin is sinful to commit mortal sin. not that the sin is grave matter? This means you can commit mortal sin without wanting to commit mortal sin? I don't think this is what I was taught...
Also, what is feigned ignorance? I have scruples. I think many things are sins. Sometimes I'll justify them as not sins of venial sins based on;
A) the catechism
B) what people have told me, or just
C) I think I'm being scrupulous here
Is this feigned ignorance? I really can't see someone just pretending they are ignorant.
The answer is, no, a sin cannot be mortal if the person committing it does not know it is mortal. The sin must be mortal, the person must KNOW it is MORTAL, and then they must fully consent for it to be a mortal sin.
Thus, if a person judges a sin venial when it is really mortal, it is still grave matter but only counts as venial on their soul because they did not know it was grave.
On the flip side of the coin, if a person commits a sin they think is mortal, even though it is only venial, it counts as mortal on their soul because they intended a mortal sin.
In answer to your feigned ignorance question:
If you are scrupulous, here is a good rule of thumb to keep on you at all times. If you are not sure whether a sin you committed in the past was mortal or venial, it is NOT A MORTAL SIN.
If there is a particular act you are not sure is mortal or venial, however, and you are considering doing it, don't do it until you are sure. This is called vincible ignorance, that is, when you intentionally keep yourself ignorant of the gravity of a sin in order to commit it without knowing if it is mortal or not. That in itself is a mortal sin.
However, I repeat: If you are not sure about a sin in your past, as to whether it was mortal or venial, IT WAS VENIAL simply because you are not sure.
I think I've answered your question, but please ask again if there's something I have not clarified properly.