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I’m not sure that is what Luther taught. As I said, Luther was not opposed to Eucharistic Adoration.
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I haven’t read anything that says “re-consecration” is necessary. The quote from the LCMS that you provided provides that the church is obligated to make available to those unable to attend Mass the things that are important - Confession/Absolution, the hearing of the word, the Lord’s Supper. In that context, and to prevent any doubt in the recipient, the liturgy of the sacrament, including the words of institution are read again. Those items once consecrated need no further consecration.
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I think the point is it may or may not continue to be His body and blood. Christ does not give us direction on this in His testament.
We should qualify what is meant by “Eucharistic Adoration” first. Presumably, what Luther was not opposed to was to reverence the sacrament with
latria such as the common practice of thinking, “my Lord and my God,” at consecration. This is certainly adoration of the Eucharist, but not what is commonly called “eucharistic adoration.” Luther was probably opposed to eucharistic processions and placing the host in a monstrance for adoration. If not, I would be interested to see writings stating otherwise. That would be a useful fact to remember.
My source for Luther’s rule to consume all elements during a single service is from his directions to Wolferinus, which you brought up earlier.
Therefore we shall define the time or the sacramental action in this way: that it starts with the beginning of the [Words of Institution] and lasts until all have communicated, have emptied the chalice, have consumed the Hosts, until the people have been dismissed and [the priest] has left the altar. In this way we shall be safe and free from the scruples and scandals of such endless questions. Dr. Philip [Melanchthon] defines the sacramental action in relation to what is outside it, that is, against reservation of and processions with the Sacrament; he does not split it up within [the action] itself, nor does he define it in such a way that it contradicts itself. Therefore see to it that if anything is left over of the Sacrament, either some communicants or the priest himself and his assistant receive it, so that it is not only a curate or someone else who drinks what is left over in the chalice, but that he gives it to the others who were also participants in the Body [of Christ], so that you do not appear to divide the Sacrament by a bad example or to treat the sacramental action irreverently. This is my opinion, and I know that it is also Philip’s opinion.
lutheranwiki.org/How_Long_are_Christ’s_Body_and_Blood_Present_in_the_Consecrated_Bread_and_the_Wine_of_Communion%3F#The_Confessions
Perhaps this thread is an example of what Luther had in mind.
The LCMS’s directives for communion of the sick, true, do not explicitly say that reconsecration is “necessary.” However, they do say, “Such worship is to be a miniature of the congregational Communion service, with… consecration…” Now, if the formerly consecrated bread was truly the Body of Christ, it would be sacrilege to reconsecrate it. This would be exactly like rebaptism. The Lutheran defense I have heard is that, because Lutherans insist strongly on the point that consecration is an effect of the Word pronounced by Christ, it is important for the communicant to hear the words of institution. However, if this were so, wouldn’t that be just as devastating an argument against infant baptism. How can Christians have assurance in their baptism, which is effected by the word of Christ, when they cannot remember the baptismal words pronounced in their infancies? Perhaps some thing just need to be taken on faith. Blessed are they that have not seen and yet have believed.
As for your proposal that the Lutheran confessions do not seek to define the duration of the real presence on way or another, I do not (for now) think this is a tenable reading of the FOC. Remember our discussion earlier about the confessional Lutheran view of transubstantiation? You said that Lutherans simply wish not to define “how the change occurs” (which, I would argue, is not an accurate representation of the doctrine of transubstantiation). However, a careful examination of the FOC condemns the belief that the bread does not retain its natural essence as a “diabolical, popetastical fiction.” I think this might be another one of those cases.
I found some Lutheran blog posts about this subject and its historical context, which had some interesting information. The author claims that Melanchthon was a receptionist, for instance. I’ll post some links later when I’m finished reading them.