Is it a sin if we did something wrong, but we didn't know? Yes it is possible for a person to sin without knowing it, including a Christian. Also, if there is any doubt that something is a mortal sin, does that mean it wasn’t a mortal sin?

We are responsible for seeing to it that we have a well-formed conscience, and that we live by that well-formed conscience. Can someone sin and not know it? Can a Christian commit sin without being aware that their actions were sinful? There are gray cases. There are gray cases. Invincible ignorance is when there's nothing you could have reasonably done to know that it was wrong. Q: If you do not know something is a mortal sin, could it possibly have been a mortal sin? In the case of masturbation, people will often have addictions, emotional issues, and even physical pain play a major role in the decision. This means their choice is at least partially coerced.

There are also some things that we should know are sins even if it was never explicitly explained to … Holman Christian Standard Bible So it is a sin for the person who knows to do what is good and doesn't do it. The rule of thumb is, “If you didn’t think it was a mortal sin at the time, it probably wasn’t.” But this is not an invariable rule. Share. In order to be culpable for a sin the person must know at some level that it is a sin. Because that takes you down a bad road of people who defined what is sin and what is not. So lets first define what is a “sin”. I read these definitions from various Catholic websites online and wanted to check with a priest to make sure. Can you commit mortal sin if you don’t know that it’s a serious sin, or not?

We were told in class that if we sinned in the past but didn't KNOW it was a sin at the time, that we didn't need to confess it. Did not know what? But this is not an invariable rule.

I am extremely nervous! I am going through the RCIA program right now to become Catholic, and I have my first Confession this Saturday.

You were morally diligent and really thought things through, but you still didn't know that it was wrong.

Contemporary English Version If you don't do what you know is right, you have sinned. If you didn't know that it's a grave matter or you don't have free choice to perform it then it cannot be a mortal sin. – R.L. I assume you mean that it was a sin? There are two different types of ignorance, as defined by Catholic doctrine: invincible and vincible. No contradiction at all. Good News Translation So then, if we do not do the good we know we should do, we are guilty of sin. So it is sin to know the good and yet not do it. "Not knowing" is also known as "ignorance." The one that is getting to me is masturbation - I had no idea this was a sin until recently. Our conscience often tells us that something is wrong even if we don’t know exactly why it is wrong.