Some posters here thought it was a sign of charity to receive communion from non-Catholic ecclesial communities. That is really a warped understanding of love. As St Paul reminds us, love rejoices in the truth, love does not rejoice in wrong. To receive communion from a non-Catholic ecclesial community would simply be lying about a communion that doesn’t exist. To use an analogy offered by some theologians, intercommunion without ecclesial communion would be no different from engaging in premarital sex. Just as premarital sex cheapens the dignity of both parties and the exalted meaning of sex in God’s creation, so intercommunion without ecclesial communion offends our Christian dignity to form a single Body and God’s invitation to full unity under one shepherd. Whether one thinks it is wrong or not doesn’t matter, the damage is objectively done.
I am not Catholic, and I agree with you. At my Lutheran church, we do not allow those who haven’t been fully instructed in our beliefs to partake in the Lord’s Supper. By attending Holy Communion, we are expressing - not only our love and obedience to the Savior - but our unity in our faith. If you are communing in another church, you are basically saying you believe as they do. As I Corinthians 11:27 states: “Therefore, whoever eats the bread or drinks the cup of the Lord in an unworthy manner will be guilty of sinning against the body and blood of the Lord.” I would imagine the Catholic Church would feel that one who accepts communion with another denomination is sinning against the body and blood of our Lord…and understandably so. I would not expect to partake in the Eucharist when I go to Mass with my husband and he, by the same token would not be allowed - nor would he want - to commune at my church because we understand that, by doing so, we would be uniting ourselves to a faith we don’t necessarily hold. By the way, I want to clarify we don’t have Wonder bread and Welch’s grape juice, as one poster seemed to indicate, and we do believe in the Real Presence - just not to the point of transubstantiation. But, unfortunately, there are differences among Lutherans as far as that goes.