Article 32
In the thirty-second article, the question is raised whether the proper dimensions of the body of Christ and the dimensions of bread that remain (In S.Th., III, q. 76 a. 5, Thomas explains that the dimensive quantity of the bread remains after the consecration while the dimensive quantity of Christ's body is not in this sacrament. In other words, the conversion that comes about terminates at the substance of Christ's body and not at its dimensions.) are unequal.
It is manifestly true to say this and something said to the contrary would be heretical because it would follow that the whole body of Christ would not be found in a small portion of a host.
Chapter 32 of 37