Reply Obj. 2: In instantaneous changes a thing is "in becoming," and is "in being" simultaneously; just as becoming illuminated and to be actually illuminated are simultaneous: for in such, a thing is said to be "in being" according as it now is; but to be "in becoming," according as it was not before.
Reply Obj. 3: As stated above (ad 1), this change comes about in the last instant of the pronouncing of the words. For then the meaning of the words is finished, which meaning is efficacious in the forms of the sacraments. And therefore it does not follow that this change is successive. _______________________
EIGHTH ARTICLE [III, Q. 75, Art. 8]
Whether This Proposition Is False: "The Body of Christ Is Made Out of
Bread"?
Objection 1: It seems that this proposition is false: "The body of Christ is made out of bread." For everything out of which another is made, is that which is made the other; but not conversely: for we say that a black thing is made out of a white thing, and that a white thing is made black: and although we may say that a man becomes black still we do not say that a black thing is made out of a man, as is shown in Phys. i. If it be true, then, that Christ's body is made out of bread, it will be true to say that bread is made the body of Christ. But this seems to be false, because the bread is not the subject of the making, but rather its term. Therefore, it is not said truly that Christ's body is made out of bread.
Obj. 2: Further, the term of becoming is something that is, or something that is made. But this proposition is never true: "The bread is the body of Christ"; or "The bread is made the body of Christ"; or again, "The bread will be the body of Christ." Therefore it seems that not even this is true: "The body of Christ is made out of bread."
Obj. 3: Further, everything out of which another is made is converted into that which is made from it. But this proposition seems to be false: "The bread is converted into the body of Christ," because such conversion seems to be more miraculous than the creation of the world, in which it is not said that non-being is converted into being. Therefore it seems that this proposition likewise is false: "The body of Christ is made out of bread."
Obj. 4: Further, that out of which something is made, can be that thing. But this proposition is false: "Bread can be the body of Christ." Therefore this is likewise false: "The body of Christ is made out of bread."
On the contrary, Ambrose says (De Sacram. iv): "When the consecration takes place, the body of Christ is made out of the bread."
I answer that, This conversion of bread into the body of Christ has something in common with creation, and with natural transmutation, and in some respect differs from both. For the order of the terms is common to these three; that is, that after one thing there is another (for, in creation there is being after non-being; in this sacrament, Christ's body after the substance of bread; in natural transmutation white after black, or fire after air); and that the aforesaid terms are not coexistent.