The Catechism says that in the Holy Eucharist we receive Jesus Christ. But because there is only one God, do we receive at the same time the Father and the Holy Spirit?
Or, for example, at Confirmation, we receive the Holy Spirit and his gifts. But it is just Him, or together with the Father and the Son?
How about this:
Sacramentally, where the bread became the Body of Christ, we receive the Body of Christ, and where the wine became the Christ’s Blood of the new Covenant, we receive the Blood of Christ.
Now, since Christ is alive and whole, we sacramentally receive the whole Body of Christ, which “concomitantly” includes his Blood, his Soul, his Essence (Divinity). The whole living Christ.
And since Christ is alive and whole, we sacramentally receive his Blood, but this also “concomitantly” includes his Body, his Soul, his Essence (Divinity). The whole living Christ.
And since Christ is “consubstantial” with the Father, with the substance of Christ, we receive also the substance of the Father, and where his Substance is, there is the Father.
And since the Holy Spirit “proceeds” from the Father and from the Son, well, you can fill in the rest.
For us, we receive things into our souls through our material bodies, whether sounds and words through our hearing, so that we might come to believe in Jesus or believe his forgiveness at confession, or through eating so that we might receive him into our souls with the material food going into our mouth. The Catholic Church is Sacramental because we are human - receiving what is spiritual by means of what is material.
Concomitant and Consubstantial - you really end up with much more than you see.
I find the real meaning and solemnity of the Eucharist, not when I am chewing or sipping, but at the words of consecration, when suddenly there is a Body on the altar sitting next to Blood on the altar, then lifted up toward heaven, toward God. Blood separated from a Body on an altar - this is a sacrifice, the Sacrifice. And it is then a covenant where we, as parties to the covenant with God, now consume the sacrifice that God has accepted as perfect.
John Martin