Transubstantiation - in Roman Catholic Theology

In Roman Catholic Theology

"Substance" here means what something is in itself. A hat's shape is not the hat itself, nor is its colour, size, softness to the touch, nor anything else about it perceptible to the senses. The hat itself (the "substance") has the shape, the color, the size, the softness and the other appearances, but is distinct from them. While the appearances, which are referred to by the philosophical term accidents, are perceptible to the senses, the substance is not.

Consider the classic example of the human body. All of the separate chemical compounds, minerals and water—which when piled together constitute the sum total of the actual physical matter of the human body—are not of themselves a human body, however much they may be physically compounded and mixed and rearranged in the laboratory, since they are still only a pile of organic chemicals, minerals and water in a particular complex configuration. If this has never been alive it is not a human body. If they are participant in the integral physical expression of a living human being who has absorbed and metabolized them, or if they are now the physical remains of a once-living human being, the substance of what they actually are is human, hence, a human body. The substantial reality of what is before us is human. The substance (substantial reality) of what is seen is not solely that of a complex organization of organic chemical compounds, but is (or has been) someone. The chemical elements of the food a person eats become in a few hours part of that person's human body and are no longer food but have been turned into the human flesh and blood and bone of that person, yet the physical chemical elements of what was once food remain the same (calcium, copper, salt, protein, sugars, fats, water, etc.). The substance of any matter that has become an integral part of any human being has ceased to be the substance or reality of food and has become incorporated as an integral part of the physical manifestation or expression of that human person. To touch that matter now is not to touch a batch of chemical compounds or food but to touch that person.

When at his Last Supper, Jesus said: "This is my body", what he held in his hands still had all the appearances of bread: these "accidents" remained unchanged. However, the Roman Catholic Church believes that, when Jesus made that declaration, the underlying reality (the "substance") of the bread was converted to that of his body. In other words, it actually was his body, while all the appearances open to the senses or to scientific investigation were still those of bread, exactly as before. The Catholic Church holds that the same change of the substance of the bread and of the wine occurs at the consecration of the Eucharist when the words are spoken "This is my body ... this is my blood." In Orthodox confessions, the change is said to take place during the Epiklesis.

Believing that Christ is risen from the dead and is alive, the Catholic Church holds that when the bread is changed into his body, not only his body is present, but Christ as a whole is present (i.e. body and blood, soul and divinity.) The same holds for the wine changed into his blood. This belief goes beyond the doctrine of transubstantiation, which directly concerns only the transformation of the bread and wine into the body and blood of Christ.

In accordance with this belief that Christ is really, truly and substantially present under the remaining appearances of bread and wine, and continues to be present as long as those appearances remain, the Catholic Church preserves the consecrated elements, generally in a church tabernacle, for administering Holy Communion to the sick and dying, and also for the secondary, but still highly prized, purpose of adoring Christ present in the Eucharist.

The Roman Catholic Church considers the doctrine of transubstantiation to be concerned with what is changed, and not how the change occurs; it teaches that the accidents that remain are real, not an illusion, and that Christ is "really, truly, and substantially present" in the Eucharist. To touch the smallest particle of the host or the smallest droplet from the chalice is to touch Jesus Christ himself, as when one person touches another on the back of the hand with only a fingertip and in so doing touches not merely a few skin cells but touches the whole person: "Christ is present whole and entire in each of the species and whole and entire in each of their parts, in such a way that the breaking of the bread does not divide Christ."

In the arguments which characterised the relationship between Roman Catholicism and Protestantism in the 16th century, the Council of Trent declared subject to the ecclesiastical penalty of anathema anyone who:

"denieth, that, in the sacrament of the most holy Eucharist, are contained truly, really, and substantially, the body and blood together with the soul and divinity of our Lord Jesus Christ, and consequently the whole Christ; but saith that He is only therein as in a sign, or in figure, or virtue" and anyone who "saith, that, in the sacred and holy sacrament of the Eucharist, the substance of the bread and wine remains conjointly with the body and blood of our Lord Jesus Christ, and denieth that wonderful and singular conversion of the whole substance of the bread into the Body, and of the whole substance of the wine into the Blood - the species only of the bread and wine remaining - which conversion indeed the Catholic Church most aptly calls Transubstantiation, let him be anathema."

Protestant denominations have not generally subscribed to belief in transubstantiation or consubstantiation.

As already stated, the Roman Catholic Church insists that the "accidents" that remain are real. In the sacrament these are the signs of the reality that they efficaciously signify. And by definition sacraments are "efficacious signs of grace, instituted by Christ and entrusted to the Catholic Church, by which divine life is dispensed to us."