work(name removed by moderator)rogress:
wouldn’t you be committing a sacrilege on top of a mortal sin without realizing it
Remember this forever:
You can never commit a sacrilege or any other kind of sin without realizing it. Ever. Ever. Ever.
You can commit an evil action without knowing that it is evil, but that is
not a sin, because you lack knowledge. It does not become a sin later when you learn that it is evil. What matters is what you knew when you committed the action. If you learn that it is evil and then do it again,
that’s a sin.
In the case that you mentioned, if you
sincerely forgot that you had committed a mortal sin earlier in the week, and then received Communion, it would not be an additional sin of sacrilege because you would lack both knowledge and consent.
Your original question implied that you were not sure if you had met the requirements for mortal sin. Let’s talk about conscience. Conscience can tell you one of three things: an action is right and lawful, an action is wrong and unlawful, or “I don’t know.” The first two constitute a
certain conscience, and you have an absolute obligation to follow the dictates of a certain conscience. (A whole other issue is your obligation to form your conscience correctly, according to the Commandments and the mind of the Church, but we’ll leave that alone for now.) The third possibility (“I don’t know”) is called a
dubious conscience. If at all possible, one should not act on a dubious conscience, but wait until a determination can be made about the lawfulness of the act in question. To do otherwise would expose an attitude of
willingness to commit a sin, even though we’re not sure about the sinfulness of the act. This is not generous with regard to the will of God, and not how we should act. If it is
absolutely necessary to act with a dubious conscience, one should choose the option on the side of charity, rather than the side of self-love - the side opposite to one’s passions. This is generally the safer course. (Material on dubious conscience taken from
The Principles of Natural Law, by Burlamaqui).
To relate this to the original question, if you were not sure whether you had actually committed a mortal sin earlier in the week, and you wondered whether you should receive Communion, you probably should not, because you don’t want to be willing to commit a sin of sacrilege. This applies to people who are
not dealing with scrupulosity, under the care and direction of their confessors. Those people should always obey, even if what they are told to do “feels” wrong. See
this thread for the kind of advice you will receive in this situation. It seems counter-intuitive, but obedience is always the best course of action in the case of true scrupulosity.
Betsy