Here online are three documents from the Congregation de Cultu Divino et Disciplina Sacramentorum. I provide some quotations:
Can someone give
even one quotation which gives either the parish priest or the bishop the authority to prohibit one of the faithful from kneeling to receive communion? Even one!
By the way, I know of no one who knees out of arogance–why should one have to be arrogant to kneel when kneeling is the proper posture of venerating the Most Holy Sacrement on the altar? Why has the GIRM reduced the reverence due to the Lord of Hosts before receiving him from kneeling to a slight bow of the head? We already have enough of a crisis of lack of faith in the Eucharist without them expending all their efforts prohibiting good Catholics from following the traditional (and, I dare say, very approprate) way of adoring the Lord.
Furthermore altar rails are not prohibited, so, how should someone stand when receiving at an altar rail?
Does anyone wonder that something like 70% of Catholics do not believe in the Real Presence? We are doing everything we can to help them to by our bodily posture. Catholicism is sacremental. What posture you assume means something. Someone who kneels to receive communion is a witness who boldly proclaims: “This is the King of Kings and the Lord of Lords! I am not just receiving bread.” In that way he should be commended and blessed, especially if he is persecuted. Christ promised persecution for those who witness to Him.
Thanks.