Hence in no way is Christ's body locally in this sacrament.
Reply Obj. 1: Christ's body is not in this sacrament definitively, because then it would be only on the particular altar where this sacrament is performed: whereas it is in heaven under its own species, and on many other altars under the sacramental species. Likewise it is evident that it is not in this sacrament circumscriptively, because it is not there according to the commensuration of its own quantity, as stated above. But that it is not outside the superficies of the sacrament, nor on any other part of the altar, is due not to its being there definitively or circumscriptively, but to its being there by consecration and conversion of the bread and wine, as stated above (A. 1; Q. 15, A. 2, sqq.).
Reply Obj. 2: The place in which Christ's body is, is not empty; nor yet is it properly filled with the substance of Christ's body, which is not there locally, as stated above; but it is filled with the sacramental species, which have to fill the place either because of the nature of dimensions, or at least miraculously, as they also subsist miraculously after the fashion of substance.
Reply Obj. 3: As stated above (A. 4), the accidents of Christ's body are in this sacrament by real concomitance. And therefore those accidents of Christ's body which are intrinsic to it are in this sacrament. But to be in a place is an accident when compared with the extrinsic container. And therefore it is not necessary for Christ to be in this sacrament as in a place. _______________________
SIXTH ARTICLE [III, Q. 76, Art. 6]
Whether Christ's Body Is in This Sacrament Movably?
Objection 1: It seems that Christ's body is movably in this sacrament, because the Philosopher says (Topic. ii) that "when we are moved, the things within us are moved": and this is true even of the soul's spiritual substance. "But Christ is in this sacrament," as shown above (Q. 74, A. 1). Therefore He is moved when it is moved.
Obj. 2: Further, the truth ought to correspond with the figure. But, according to the commandment (Ex. 12:10), concerning the Paschal Lamb, a figure of this sacrament, "there remained nothing until the morning." Neither, therefore, if this sacrament be reserved until morning, will Christ's body be there; and so it is not immovably in this sacrament.
Obj. 3: Further, if Christ's body were to remain under this sacrament even until the morrow, for the same reason it will remain there during all coming time; for it cannot be said that it ceases to be there when the species pass, because the existence of Christ's body is not dependent on those species. Yet Christ does not remain in this sacrament for all coming time. It seems, then, that straightway on the morrow, or after a short time, He ceases to be under this sacrament. And so it seems that Christ is in this sacrament movably.
On the contrary, it is impossible for the same thing to be in motion and at rest, else contradictories would be verified of the same subject. But Christ's body is at rest in heaven. Therefore it is not movably in this sacrament.