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Roman Catechism
Presence In Virtue Of The Sacrament And In Virtue Of Concomitance
Pastors, however, should not fail to observe that in this Sacrament not all these things are contained after the same manner, or by the same power. Some things, we say, are present in virtue of the consecration; for as the words of consecration effect what they signify, sacred writers usually say that whatever the form expresses, is contained in the Sacrament by virtue of the Sacrament. Hence, could we suppose any one thing to be entirely separated from the rest, the Sacrament, they teach, would be found to contain solely what the form expresses and nothing more.
On the other hand, some things are contained in the Sacrament because they are united to those which are expressed in the form. For instance, the words This is my body, which comprise the form used to consecrate the bread, signify the body of the Lord, and hence the body itself of Christ the Lord is contained in the Eucharist by virtue of the Sacrament. Since, however, to Christ’s body are united His blood, His soul, and His Divinity, all of these also must be found to coexist in the Sacrament; not, however, by virtue of the consecration, but by virtue of the union that subsists between them and His body. All these are said to be in the Eucharist by virtue of concomitance. Hence it is clear that Christ, whole and entire, is contained in the Sacrament; for when two things are actually united, where one is, the other must also be.