The Blessed Sacrament is Truly Emmanuel | Regis Scanlon, O.F.M. Cap.
Paul VI stated in his encyclical, Mysterium Fidei, that, after the consecration of the Mass, "Christ is present whole and entire in His physical 'reality,' corporeally present, although not in the manner in which bodies are in a place (totus et integer Christus adest in sua physica 'realitate' etiam corporaliter praesens, licet non eo modo quo corpora adsunt in loco)." 
How a "physical 'reality"' can be "corporeally" present and not be limited or restricted to one place, like all miracles, will be an apparent contradiction to our modern scientific mentality. Paul VI recognized this when he said "how can something like this exist when it seems to contradict the known laws of physics and biology?"  The solution for Paul VI was quite simple: "And so we must approach this mystery in particular with humility and reverence, not relying on human reasoning, which ought to hold its peace, but rather adhering firmly to divine Revelation." 
Some theologians are scandalized by Paul VI's statement in Mysterium Fidei. They cannot accept that this physical Thing (the Blessed Sacrament) is the "physical 'reality'" of Christ "corporeally present." Perhaps they cannot accept miracles. There may also be another reason. They know that the Church teaches that the act of "latria (act of adoration)" is to be given to the Blessed Sacrament. They also know that "true latria according to our faith ... is proper to divine nature alone."  So, they ask: How can something divine be physical? How can we say that something "physical" can be adored? Is not this adoring something created? Is not this adoring created being?
Most likely, it was for the above reasons that Tad W. Guzie, S. J. of Marquette University inferred that the physical thing that is present after the consecration of the Mass is just physical bread, not the physical body of Jesus Christ. He described the change that takes place in the bread and wine at the consecration in the following manner:
This is also probably why Fr. Edward Schillebeeckx, O.P., stated in his book, The Eucharist, that "I kneel, not before a Christ who is, as it were, condensed in the host, but before the Lord himself who is offering his reality, his body, to me through the host."  And, it is probably why Anthony J. Wilhelm, the author of Christ Among Us (which boasts of "2 million copies sold"), stated about the change in the bread and wine after the consecration:
Thus, a clear and correct grasp of the Church's understanding of being, and the difference between nature and person in Jesus Christ, can have an effect upon people's belief in the mystery of the Incarnation and the Eucharist. The Church's understanding of these subjects is best obtained by examining the philosophy and theology of St. Thomas Aquinas. The teachings of St. Thomas have been tested for hundreds of years and have been found most reliable for grasping the truths of the Catholic Faith. In fact, the Second Vatican Council states that the Church uses a "method" in education in which "the convergence of faith and reason in the one truth may be seen more clearly."  And the Council says, "This method follows the tradition of the doctors of the Church and especially St. Thomas Aquinas." 
St. Thomas's theology and philosophy, is quite different from the fluffy pop-theology which is so prevalent today. While many avoid the writings of St. Thomas because of his abstract concepts, taxing terms, demanding distinctions, and rigorous logic, there is no more precise and safer way to come to the truth. Sometimes learning is challenging work. There are passages in St. Thomas's writings which require re-reading to grasp them.
Let us use the writings of St. Thomas to examine the Church's teachings on the being, nature, and Person of Jesus Christ.
St. Thomas's Principles of Being
The Church teaches that Jesus Christ has a full human nature and a full divine nature, which are united in the "Person"  or "hypostasis"  of Jesus Christ. This union, therefore, is called a "hypostatic" union.  The Church also teaches that our Lord Jesus Christ is "consubstantial with the Father according to divine nature, consubstantial with us according to the human nature."  Two good questions to help guide our thoughts in the task of understanding the being, nature, and Person of Jesus Christ would be: "Can Christ be called a human person?" and "Can Christ be called a human being?" But first, one must understand the meaning of substance and how substance differs from accident according to St. Thomas Aquinas.
St. Thomas teaches that a "substance" is something which has "being through itself (per se) because it is not in another."  He says that "A substance is a thing to which it belongs to be not in a subject."  In other words, a substance stands on its own. But, an "accident" is a "being in another (in alio)."  For St. Thomas, "accidents" "do not have being in themselves, independent of a subject." 
Secondly, St. Thomas says that the term substance has two meanings:
According to the Philosopher (Metaph. v), substance is twofold. In one sense it means the quiddity (whatness) of a thing signified by its definition, and thus we say that the definition means the substance of a thing; in which sense substance is called by the Greeks ousia, which we may call essence (or nature). In another sense substance means a subject or suppositum, which subsists in the genus of substance. To this, taken in a general sense, can be applied a name expressive of an intention; and thus it is called the suppositum. It is also called by three names signifying a reality - that is, a thing of nature, subsistence, and hypostasis, according to a threefold consideration of the substance thus named. For, as it exists in itself and not in another, it is called subsistence; as we say that those things subsist which exist in themselves, and not in another. As it underlies some common nature it is called a thing of nature; as, for instance, this particular man is a human natural thing. As it underlies the accidents, it is called hypostasis, or substance. What these three names signify in common to the whole genus of substances, this name person signifies in the genus of rational substances. 
So, for St. Thomas, the term "substance" can mean "essence" (which also means nature) or it can mean "hypostasis" (which is also called a "suppositum," "subject," "subsistence" or "thing of nature"). In a rational or intelligent substance this "hypostasis" is called a "person."
It is important to be able to distinguish the "nature" (or "essence") from the "suppositum" ("hypostasis" or "person") in things composed of matter and form like the human being. St. Thomas says:
Can We Call Christ a Human Person?
When the Church teaches that Jesus is "consubstantial with us according to the human nature" she means substance in the sense of "essence" or "nature," but not substance in the sense of "suppositum," "hypostasis," or "person." Jesus does not have a human "suppositum," human "hypostasis" or human "person" in common with us. The Council of Toledo XI officially taught that "God the Word has not received the person of man, but the nature, and to the eternal person of divinity He has united the temporal substance of flesh."  And Church councils have defined that Jesus Christ is a divine Person.  This is why the Catechism of the Catholic Church states: "Christ's humanity has no other subject than the divine person of the son of God, who assumed it and made it his own, from conception.  John Paul II also states:
According to St. Thomas, some have held that this Nestorian
"error" also included the notion that in Christ "there is
one person of the Word of God and that of man" such that "in Christ
the hypostasis and supposit of that man is one and that of the Word of God
another, but that there is one person of each of the two."  While
this idea ultimately collapses into the Nestorian "error" of "two
persons" in Christ," here this idea could be suggesting that the
Person of Christ was a blend or a mixture of a human hypostasis
and a divine hypostasis. However, to say that Jesus Christ is a "human
and divine Person" in the sense of a blended Person would be
to say that He is a hybrid of God and man, rather than fully God
and fully Man. But, the Church has already defined that in the hypostatic
union the divinity and humanity are in Christ "without mingling"
or "confusion" of natures and "not because the distinctions
of the natures was destroyed by the union." Thus, the Church also
defined that Jesus Christ is "whole God" and "whole man"
and not part God and part Man. So, one cannot call Christ a "human
and divine Person" for any reason whatsoever. The question then follows:
"Can we call Christ a human being?"
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