…is your contention that he is reading a Sacramentary during Mass?
From the OP, it appears he was reading from a missalette in the pews.
Otherwise, your objection makes very little sense. The Eucharistic prayer does not appear in anything he should be reading during Mass unless, as stated, he is actually reading the Missal.
Hunh? When I was a kid, we had missalettes (we called them Missals, but the most certainly weren’t what I think you are calling a Missal, as in Sacramentary; it had the Latin on one side and English on the other - the whole Mass). We still have missalettes in the pews, with the exception of those idiots who want to take the posture that the “Gospel is to be proclaimed”, meaning that those who are visual learners, as opposed to the now exalted aural learners, are to be cast into the outer darkness, and have done away with the missalettes.
And no, this isn’t an issue of “leave the guy to his prayers” because, frankly, they are not his prayers, they are prayers reserved for the priest. They are prayers of offering a sacrifice that he, as a layperson, cannot offer.
Well, pardon me! I learned that we were to join our prayers to the prayers of the priest, and the best way to do that was to be reading along in the missalette in English while he said the prayers in Latin. Darn, those old heresies of pre-Vatican 2 piety! Or are you now going to say that because we read them in English and he was saying them in Latin, that that was different? And of course, then Vatican 2 and subsequent legislation allowing the Mass in the vernacular - wow, another heresy! Why, if reading along as the priest says them is wrong, perhaps even listening is forbidden!
As for your lesson in humility bit, I actually take offense to that. I take offense on behalf of any Catholic who wishes to remain true to the church. You are defending what you admit could be a bad habit picked up from the Charismatic movement. The charitable thing to do would be to politely inform your brother in Christ that the prayers he is reciting are reserved for the priest. If he refuses to listen, well, not much you can do beyond that.
As I find your post offensive. Guess this forum is an equal offense opportunity. I am not defending a bad habit possibly picked up from the Charismatice Movement; I only suggested that might be one possible explanation of why he did it. I made the point to clarify that there might be another reason - the one I suggested next, which I think is way mroe possible. In my humble experience, there are more poor readers than there are people with experience of the Charismatic Movement.
However, telling people they need a lesson in humility because they take offense to a man praying the prayers intended for the priest when he is not a priest, is like telling a Jewish person they have no right to be offended because I go into their synagogue and attempt to lead services. It just doesn’t make sense.
Following the Spirit of the Law does NOT negate the law itself, and as Catholics, we have a Canon Law, a Catechism and an Instruction for the Order of the Mass (GIRM) that must be followed. It is that Sacred Tradition which serves as a link on this earth to Jesus and his ministry on earth just as our spirituality links us to God always and forever.
Perhaps you should actually read what I really said. Unless you are taking the position that the world wide Church is in gross violation of your perceived law, I would suggest that my post applies to you. He is most likely reading the prayers as the priest says them, something that was encouraged and continues to be encouraged since well before Vatican 2. Strangely, therre seem to be a whole lot of priests, bishops and
Cardinals who think that it is perfectly alright to read teh Eucharistic Prayer as the priest says it; I have even seen a copy of it in Vietnamese.
I was suggesting that instead of judging automatically that he is somehow usurping the priest’s roll, that we give the poor guy the benefit of the doubt that he is just a poor reader who reads with his lips.
Sometimes I listen to Father say the Eucharistic Prayer; and sometinmes, when my ADD is kicking into high gear, I read along with him as he says it. Never in my life have I ever intended to usurp his roll. I just don’t read by moving my lips. But I sure have met a lot of poor readers who do.