Let’s use an example.
God said to Adam & Eve, don’t do THAT over there or you will die.
- they are given a command by God.
- They have knowledge of grave wrong
- they know of consequence if they disobey God
Adam & Eve aren’t mentally challenged. They are intellegent people, and they have the ability to reason. And they chose to disobey
When they committed the sin, their consent / decision to sin, only had to be sufficient that it’s a choice. Same with anybody who sins. It’s not some big mystery. It’s not any more complicated than that…
**1859 **Mortal sin requires
full knowledge and
complete consent. It presupposes knowledge of the sinful character of the act, of its opposition to God’s law. It also implies a consent sufficiently deliberate to be a personal choice. Feigned ignorance and hardness of heart do not diminish, but rather increase, the voluntary character of a sin.
lack of knowledge isn’t always innocent
[
1791 (
Catechism of the Catholic Church - Paragraph # 1791) ignorance can often be imputed to personal responsibility. This is the case when a man “takes little trouble to find out what is true and good, or when conscience is by degrees almost blinded through the habit of committing sin.” In such cases, the person is culpable for the evil he commits.
When scripture says one is condemned, or won’t inherit heaven, etc etc, if they die in any of those sins scripture lists, then we can be sure that, that class of sin listed, are mortal sins.
It’s not complicated.