I have heard the closed communion explanation before (and the close communion explanation from Lutherans) - but it doesn't satisfy because the priest or minister cannot know the mind and heart of the ones who do or do not partake of the cup and the bread.
From Corinthians in context:
The cup of blessing which we bless, is it not the communion of the blood of Christ? The bread which we break, is it not the communion of the body of Christ? For we [being] many are one bread, [and] one body: for we are all partakers of that one bread. I Cor 10:16-17
For I have received of the Lord that which also I delivered unto you, That the Lord Jesus the [same] night in which he was betrayed took bread: And when he had given thanks, he brake [it], and said, Take, eat: this is my body, which is broken for you: this do in remembrance of me. After the same manner also [he took] the cup, when he had supped, saying, This cup is the new testament in my blood: this do ye, as oft as ye drink [it], in remembrance of me. For as often as ye eat this bread, and drink this cup, ye do shew the Lord's death till he come. I Cor 11:23-26
But let a man examine himself, and so let him eat of [that] bread, and drink of [that] cup. For he that eateth and drinketh unworthily, eateth and drinketh damnation to himself, not discerning the Lord's body. For this cause many [are] weak and sickly among you, and many sleep. For if we would judge ourselves, we should not be judged. But when we are judged, we are chastened of the Lord, that we should not be condemned with the world. - I Cor 11:28-32
For as the body is one, and hath many members, and all the members of that one body, being many, are one body: so also [is] Christ. For by one Spirit are we all baptized into one body, whether [we be] Jews or Gentiles, whether [we be] bond or free; and have been all made to drink into one Spirit. For the body is not one member, but many. - I Cor 12:12-14
Now ye are the body of Christ, and members in particular. I Cor 12:27
For we are members of his body, of his flesh, and of his bones. Ephesians 5:30
And he is the head of the body, the church: who is the beginning, the firstborn from the dead; that in all [things] he might have the preeminence. Colossians 1:18
For as we have many members in one body, and all members have not the same office: So we, [being] many, are one body in Christ, and every one members one of another. Romans 12:4-5
God's Name is I AM.
But you can go up for a blessing just cross your arms like an x and you will get an apostolic blessing.You do it during the line for communion.
True, but look at it this way -- for Lutherans, Orthodox, Catholics, traditional Anglicans, that IS the Body of Christ that we are partaking of -- sacred because that is Christ's body.
1 Cor 11:27-29
[27] Therefore whosoever shall eat this bread, or drink the chalice of the Lord unworthily, shall be guilty of the body and of the blood of the Lord. [28] But let a man prove himself: and so let him eat of that bread, and drink of the chaliceWe also believe that to eat of this unworthily puts one at risk of defying God.
now you may not believe this -- it is your choice.
But if the Eucharist is no more than mere bread to a person, how can we jointly share it?
Correspondingly, to a person who thinks it is just bread, isn't the partaking an acquiscence that this is real?
you are right that the minister doesn't know the heart and mind of the person, but I point out the difficulties if two who have such utterly opposite concepts of the Eucharist partake of it together -- it doesn't work.
When the eucharist is desecrated in such a manner, the sin falls also upon the person who allowed such a person to partake in the eucharist. This is precisely why St. John Crysostom (the golden-mouthed) warned that the floor of Hell is paved with the skulls of bishops: because bishops bear the moral responsibility of sins they fail to correct.