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I think it would be helpful to read the words in the Eucharistic texts…
While a case might be made that it "IS’ what Scripture says when it says it “IS” - we might agree as to WHEN Christ’s Body and Blood are present - there is simply nothing on the other “end” of the time frame, one way or the other.
As far as I know, not only is Scripture silent on that point, but so are The Lutheran Confessions. There is no Lutheran doctrine on this.
Now, that does not eliminate the possibility of opinions. But opinions is not binding dogma.
As I understand it, many Lutherans did (and still do) hold to “Sacramental Union.” It’s not a well-defined position, and not doctrine. BASICALLY, it holds that the Body of Blood of Our Lord are in “union” with the bread and wine IN THE SACRAMENT. I add the emphasis on the last point, because it seems to be the centerpiece of the discussion here. Sacramental actions are ACTIONS. The effects of such are eternal, but the action itself is not. I was baptized (with an eye dropper) within seconds of my birth, with one drop of water. Water is still not dropping from my head - indeed, that water was probably whipped off and only God knows where it is now (water is rarely destroyed, nearly all of the water on the planet 4.6 billion years ago is still here - in some form). I think SOME Lutherans would say that a Sacrament is not ONLY the Promise but also the ACTION - and thus it is what it is as it is done, given, received. Thus, when the Mass is complete, and the Sacrament ENDED, the issue is moot. In the same way as it is moot what became of the drop of water God connected with His promise in Baptism. For these Lutherans, a Sacrament is not a stagnate and eternal reality but is an ACTION - a blessing, a giving. For them, while the elements should be treated with respect (I see this as similar to the respect we give Our Lady), it is simply no longer a Sacrament and so the Sacramental Union is no longer. I’m not SURE I agree with that - but I think it is a common Lutheran pious opinion.
BTW, I DO NOT want to be disrespectful to the Holy Sacrament or to our Catholic brothers and sisters here, but I think this concept is not entirely absent in Catholicism. My Catholic teacher and I had a goodly number of discussions about Real Presence and Transubstantiation - and we got into this point. She WELCOMED my frank questions (knowing my heart) and this point - does CHRIST remain - lead me to wonder about the digestive process. When we urinate, for example, are we placing Jesus in the… you know? Her words to me were this (I can paraphrase this, I think), “Of course, like you, we find that unthinkable. When we receive the Eucharist, we receive Christ in our heart and soul, so that what is eliminated is just bread and wine.” ASSUMING that is a valid Catholic position (I don’t know), then in Catholicism, there is also some sense of “Sacramental Union” - perhaps less defined than even in Lutheranism. There is a sense IN TIME where Christ is no longer “present” but only Aristotelian accidents of bread and wine (or we would argue, bread and wine). OTHERWISE, there would need to be the same care of our biological excretments for 24 hours after the Mass as there is in dealing with the same percentage of elements not consumed at the Mass. To me, all this is frankly mystery and probably LEFT ALONE - and that’s largely my response to this issue: DOES Christ, in any sense, cease to be “present” in the Holy Eucharist? To me, there are questions best left unasked. It’s not the point. The issue is singular: Christ IS present as we receive the Holy Eucharist - present with all His grace, mercy and transforming power. Accept THAT. Leave the rest where Scripture does - ALONE. Lutherans are pretty good at that, btw, at least in terms of dogma.
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