I understand that Catholics teach both that the Eucharist is Jesus’ glorified body in heaven and also that the Eucharist is not many sacrifices, but one sacrifice. If it is just one sacrifice, would it not be Jesus’ body crucified on the cross?
Catechism of the Catholic Church
1330 The *memorial *of the Lord’s Passion and Resurrection.
The Holy Sacrifice, because it makes present the one sacrifice of Christ the Savior and includes the Church’s offering. The terms holy sacrifice of the Mass, “sacrifice of praise,” spiritual sacrifice, pure and holy sacrifice are also used,150 since it completes and surpasses all the sacrifices of the Old Covenant. [INDENT] The Holy and Divine Liturgy, because the Church’s whole liturgy finds its center and most intense expression in the celebration of this sacrament; in the same sense we also call its celebration the Sacred Mysteries. We speak of the Most Blessed Sacrament because it is the Sacrament of sacraments. The Eucharistic species reserved in the tabernacle are designated by this same name.
Since the Sacrifice of Christ is once and for all time then how can we participate into it? Here our Lord instituted the Mass and the Divine Liturgy. You are transported to that one Sacrifice. You are there. You are a participant. St. Symeon the New Theologian, an Eastern Father said that whenever you go to Mass or the Divine Liturgy, stand trembling as if the Son of God is being crucified before your very eyes! This is not something trivial when we attend to the Mass and the Divine Liturgy. Are you there to be His excucutioner or are you there to be with Him on that Cross? The Mass and the Divine Liturgy transcends all sense of time for the Sacrifice of our Lord is made present before us. You are there and His Sacrifice is made present and all of humanity must decide to where they must go and must be. The Sacrifice is now present in Hong Kong, Halifax, London, New York and so on. This generation is no different than the one Jesus first came to. Every generation plays out in the same manner as the first one Jesus ministered to. We have different actors but the same play.
“the Eucharist is Jesus’ glorified body in heaven”
Not strictly correct. The Eucharist is Jesus’ in Sacramental Form, which is a different Reality to that which He is in Heaven.
When we receive Communion we are receiving the Risen, Glorified Christ.
Quite so; but not as He is in Heaven.
Heaven is created as are our bodies, including the corporal body of Christ. Also the soul is individually created for each person by God and infused into the body at the time of human insemination. Besides the created body, blood, soul, we receive also the divinity.** ("****the soul of Christ is the first and most perfect of all created spirits, and cannot be deprived of a privilege granted to the angels.")
Catechism of the Catholic Church**
326 The Scriptural expression “heaven and earth” means all that exists, creation in its entirety. It also indicates the bond, deep within creation, that both unites heaven and earth and distinguishes the one from the other: “the earth” is the world of men, while “heaven” or “the heavens” can designate both the firmament and God’s own “place” - “our Father in heaven” and consequently the “heaven” too which is eschatological glory. Finally, “heaven” refers to the saints and the “place” of the spiritual creatures, the angels, who surround God.186**
327** The profession of faith of the Fourth Lateran Council (1215) affirms that God "from the beginning of time made at once (simul) out of nothing both orders of creatures, the spiritual and the corporeal, that is, the angelic and the earthly, and then (deinde) the human creature, who as it were shares in both orders, being composed of spirit and body."187
659 "So then the Lord Jesus, after he had spoken to them, was taken up into heaven, and sat down at the right hand of God."532 Christ’s body was glorified at the moment of his Resurrection, as proved by the new and supernatural properties it subsequently and permanently enjoys.533 But during the forty days when he eats and drinks familiarly with his disciples and teaches them about the kingdom, his glory remains veiled under the appearance of ordinary humanity.534 Jesus’ final apparition ends with the irreversible entry of his humanity into divine glory, symbolized by the cloud and by heaven, where he is seated from that time forward at God’s right hand.535 Only in a wholly exceptional and unique way would Jesus show himself to Paul “as to one untimely born”, in a last apparition that established him as an apostle.536