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Roman Catechism
A Consequence Of Transubstantiation

The pastor should next teach that our Lord is not in the Sacrament as in a place. Place regards things only inasmuch as they have magnitude. Now we do not say that Christ is in the Sacrament inasmuch as He is great or small, terms which belong to quantity, but inasmuch as He is a substance. The substance of the bread is changed into the substance of Christ, not into magnitude or quantity; and substance, it will be acknowledged by all, is contained in a small as well as in a large space. The substance of air, for instance, and its entire nature must be present under a small as well as a large quantity, and likewise the entire nature of water must be present no less in a glass than in a river. Since, then, the body of our Lord succeeds to the substance of the bread, we must confess it to be in the Sacrament after the same manner as the substance of the bread was before consecration; whether the substance of the bread was present in greater or less quantity is a matter of entire indifference.