Now it is evident that the body and blood of Christ abide in this sacrament so long as the species remain numerically the same, as stated above (A. 4; Q. 76, A. 6, ad 3); because it is this bread and this wine which is consecrated. Hence, if the liquid of any kind whatsoever added be so much in quantity as to permeate the whole of the consecrated wine, and be mixed with it throughout, the result would be something numerically distinct, and the blood of Christ will remain there no longer. But if the quantity of the liquid added be so slight as not to permeate throughout, but to reach only a part of the species, Christ's blood will cease to be under that part of the consecrated wine, yet will remain under the rest.
Reply Obj. 1: Pope Innocent III in a Decretal writes thus: "The very accidents appear to affect the wine that is added, because, if water is added, it takes the savor of the wine. The result is, then, that the accidents change the subject, just as subject changes accidents; for nature yields to miracle, and power works beyond custom." But this must not be understood as if the same identical accident, which was in the wine previous to consecration, is afterwards in the wine that is added; but such change is the result of action; because the remaining accidents of the wine retain the action of substance, as stated above, and so they act upon the liquid added, by changing it.
Reply Obj. 2: The liquid added to the consecrated wine is in no way mixed with the substance of Christ's blood. Nevertheless it is mixed with the sacramental species, yet so that after such mixing the aforesaid species are corrupted entirely or in part, after the way mentioned above (A. 5), whereby something can be generated from those species. And if they be entirely corrupted, there remains no further question, because the whole will be uniform. But if they be corrupted in part, there will be one dimension according to the continuity of quantity, but not one according to the mode of being, because one part thereof will be without a subject while the other is in a subject; as in a body that is made up of two metals, there will be one body quantitatively, but not one as to the species of the matter.
Reply Obj. 3: As Pope Innocent says in the aforesaid Decretal, "if after the consecration other wine be put in the chalice, it is not changed into the blood, nor is it mingled with the blood, but, mixed with the accidents of the previous wine, it is diffused throughout the body which underlies them, yet without wetting what surrounds it." Now this is to be understood when there is not sufficient mixing of extraneous liquid to cause the blood of Christ to cease to be under the whole; because a thing is said to be "diffused throughout," not because it touches the body of Christ according to its proper dimensions, but according to the sacramental dimensions, under which it is contained. Now it is not the same with holy water, because the blessing works no change in the substance of the water, as the consecration of the wine does.
Reply Obj. 4: Some have held that however slight be the mixing of extraneous liquid, the substance of Christ's blood ceases to be under the whole, and for the reason given above (Obj. 4); which, however, is not a cogent one; because "more" or "less" diversify dimensive quantity, not as to its essence, but as to the determination of its measure. In like manner the liquid added can be so small as on that account to be hindered from permeating the whole, and not simply by the dimensions; which, although they are present without a subject, still they are opposed to another liquid, just as substance would be if it were present, according to what was said at the beginning of the article. _______________________
QUESTION 78
OF THE FORM OF THIS SACRAMENT
(In Six Articles)
We must now consider the form of this sacrament; concerning which there are six points of inquiry:
(1) What is the form of this sacrament?
(2) Whether the form for the consecration of the bread is appropriate?