But such accidents could have been previously corrupted in two ways: in one way, of themselves; in another way, accidentally. They could be corrupted of themselves, as by alteration of the qualities, and increase or decrease of the quantity, not in the way in which increase or decrease is found only in animated bodies, such as the substances of the bread and wine are not, but by addition or division; for, as is said in Metaph. iii, one dimension is dissolved by division, and two dimensions result; while on the contrary, by addition, two dimensions become one. And in this way such accidents can be corrupted manifestly after consecration, because the dimensive quantity which remains can receive division and addition; and since it is the subject of sensible qualities, as stated above (A[1]), it can likewise be the subject of their alteration, for instance, if the color or the savor of the bread or wine be altered.
An accident can be corrupted in another way, through the corruption of its subject, and in this way also they can be corrupted after consecration; for although the subject does not remain, still the being which they had in the subject does remain, which being is proper, and suited to the subject. And therefore such being can be corrupted by a contrary agent, as the substance of the bread or wine was subject to corruption, and, moreover, was not corrupted except by a preceding alteration regarding the accidents.
Nevertheless, a distinction must be made between each of the aforesaid corruptions; because, when the body and the blood of Christ succeed in this sacrament to the substance of the bread and wine, if there be such change on the part of the accidents as would not have sufficed for the corruption of the bread and wine, then the body and blood of Christ do not cease to be under this sacrament on account of such change, whether the change be on the part of the quality, as for instance, when the color or the savor of the bread or wine is slightly modified; or on the part of the quantity, as when the bread or the wine is divided into such parts as to keep in them the nature of bread or of wine. But if the change be so great that the substance of the bread or wine would have been corrupted, then Christ's body and blood do not remain under this sacrament; and this either on the part of the qualities, as when the color, savor, and other qualities of the bread and wine are so altered as to be incompatible with the nature of bread or of wine; or else on the part of the quantity, as, for instance, if the bread be reduced to fine particles, or the wine divided into such tiny drops that the species of bread or wine no longer remain.
Reply to Objection 1: Since it belongs essentially to corruption to take away the being of a thing, in so far as the being of some form is in matter, it results that by corruption the form is separated from the matter. But if such being were not in matter, yet like such being as is in matter, it could be taken away by corruption, even where there is no matter; as takes place in this sacrament, as is evident from what was said above.
Reply to Objection 2: Although the sacramental species are forms not in matter, yet they have the being which they had in matter.
Reply to Objection 3: This corruption of species is not miraculous, but natural; nevertheless, it presupposes the miracle which is wrought in the consecration, namely, that those sacramental species retain without a subject, the same being as they had in a subject; just as a blind man, to whom sight is given miraculously, sees naturally.
Whether anything can be generated from the sacramental species?
Objection 1: It seems that nothing can be generated from the sacramental species: because, whatever is generated, is generated out of some matter: for nothing is generated out of nothing, although by creation something is made out of nothing. But there is no matter underlying the sacramental species except that of Christ's body, and that body is incorruptible. Therefore it seems that nothing can be generated from the sacramental species.
Objection 2: Further, things which are not of the same genus cannot spring from one another: thus a line is not made of whiteness. But accident and substance differ generically. Therefore, since the sacramental species are accidents, it seems that no substance can be generated from them.
Objection 3: Further, if any corporeal substance be generated from them, such substance will not be without accident. Therefore, if any corporeal substance be generated from the sacramental species, then substance and accident would be generated from accident, namely, two things from one, which is impossible. Consequently, it is impossible for any corporeal substance to be generated out of the sacramental species.
On the contrary, The senses are witness that something is generated out of the sacramental species, either ashes, if they be burned, worms if they putrefy, or dust if they be crushed.
I answer that, Since "the corruption of one thing is the generation of another" (De Gener. i), something must be generated necessarily from the sacramental species if they be corrupted, as stated above (A[4]); for they are not corrupted in such a way that they disappear altogether, as if reduced to nothing; on the contrary, something sensible manifestly succeeds to them.
Nevertheless, it is difficult to see how anything can be generated from them. For it is quite evident that nothing is generated out of the body and blood of Christ which are truly there, because these are incorruptible. But if the substance, or even the matter, of the bread and wine were to remain in this sacrament, then, as some have maintained, it would be easy to account for this sensible object which succeeds to them. But that supposition is false, as was stated above (Q[75], AA[2],4,8).
Hence it is that others have said that the things generated have not sprung from the sacramental species, but from the surrounding atmosphere. But this can be shown in many ways to be impossible. In the first place, because when a thing is generated from another, the latter at first appears changed and corrupted; whereas no alteration or corruption appeared previously in the adjacent atmosphere; hence the worms or ashes are not generated therefrom. Secondly, because the nature of the atmosphere is not such as to permit of such things being generated by such alterations. Thirdly, because it is possible for many consecrated hosts to be burned or putrefied; nor would it be possible for an earthen body, large enough to be generated from the atmosphere, unless a great and, in fact, exceedingly sensible condensation of the atmosphere took place. Fourthly, because the same thing can happen to the solid bodies surrounding them, such as iron or stone, which remain entire after the generation of the aforesaid things. Hence this opinion cannot stand, because it is opposed to what is manifest to our senses.
And therefore others have said that the substance of the bread and wine returns during the corruption of the species, and so from the returning substance of the bread and wine, ashes or worms or something of the kind are generated. But this explanation seems an impossible one. First of all, because if the substance of the bread and wine be converted into the body and blood of Christ, as was shown above (Q[75], AA[2],4), the substance of the bread and wine cannot return, except the body and blood of Christ be again changed back into the substance of bread and wine, which is impossible: thus if air be turned into fire, the air cannot return without the fire being again changed into air. But if the substance of bread or wine be annihilated, it cannot return again, because what lapses into nothing does not return numerically the same. Unless perchance it be said that the said substance returns, because God creates anew another new substance to replace the first. Secondly, this seems to be impossible, because no time can be assigned when the substance of the bread returns. For, from what was said above (A[4]; Q[76], A[6], ad 3), it is evident that while the species of the bread and wine remain, there remain also the body and blood of Christ, which are not present together with the substance of the bread and wine in this sacrament, according to what was stated above (Q[75], A[2]). Hence the substance of the bread and wine cannot return while the sacramental species remain; nor, again, when these species pass away; because then the substance of the bread and wine would be without their proper accidents, which is impossible. Unless perchance it be said that in the last instant of the corruption of the species there returns (not, indeed, the substance of bread and wine, because it is in that very instant that they have the being of the substance generated from the species, but) the matter of the bread and wine; which, matter, properly speaking, would be more correctly described as created anew, than as returning. And in this sense the aforesaid position might be held.
However, since it does not seem reasonable to say that anything takes place miraculously in this sacrament, except in virtue of the consecration itself, which does not imply either creation or return of matter, it seems better to say that in the actual consecration it is miraculously bestowed on the dimensive quantity of the bread and wine to be the subject of subsequent forms. Now this is proper to matter; and therefore as a consequence everything which goes with matter is bestowed on dimensive quantity; and therefore everything which could be generated from the matter of bread or wine, if it were present, can be generated from the aforesaid dimensive quantity of the bread or wine, not, indeed, by a new miracle, but by virtue of the miracle which has already taken place.
Reply to Objection 1: Although no matter is there out of which a thing may be generated, nevertheless dimensive quantity supplies the place of matter, as stated above.
Reply to Objection 2: Those sacramental species are indeed accidents, yet they have the act and power of substance, as stated above (A[3]).
Reply to Objection 3: The dimensive quantity of the bread and wine retains its own nature, and receives miraculously the power and property of substance; and therefore it can pass to both, that is, into substance and dimension.
Whether the sacramental species can nourish?
Objection 1: It seems that the sacramental species cannot nourish, because, as Ambrose says (De Sacram. v), "it is not this bread that enters into our body, but the bread of everlasting life, which supports the substance of our soul." But whatever nourishes enters into the body. Therefore this bread does not nourish: and the same reason holds good of the wine.
Objection 2: Further, as is said in De Gener. ii, "We are nourished by the very things of which we are made." But the sacramental species are accidents, whereas man is not made of accidents, because accident is not a part of substance. Therefore it seems that the sacramental species cannot nourish.
Objection 3: Further, the Philosopher says (De Anima ii) that "food nourishes according as it is a substance, but it gives increase by reason of its quantity." But the sacramental species are not a substance. Consequently they cannot nourish.
On the contrary, The Apostle speaking of this sacrament says ( 1 Cor. 11:21 ): "One, indeed, is hungry, and another is drunk": upon which the gloss observes that "he alludes to those who after the celebration of the sacred mystery, and after the consecration of the bread and wine, claimed their oblations, and not sharing them with others, took the whole, so as even to become intoxicated thereby." But this could not happen if the sacramental species did not nourish. Therefore the sacramental species do nourish.
I answer that, This question presents no difficulty, now that we have solved the preceding question. Because, as stated in De Anima ii, food nourishes by being converted into the substance of the individual nourished. Now it has been stated (A[5]) that the sacramental species can be converted into a substance generated from them. And they can be converted into the human body for the same reason as they can into ashes or worms. Consequently, it is evident that they nourish.