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Roman Catechism
Transubstantiation A Total Conversion
This conversion, then, is so effected that the whole substance of the bread is changed by the power of God into the whole substance of the body of Christ, and the whole substance of the wine into the whole substance of His blood, and this, without any change in our Lord Himself. He is neither begotten, nor changed, not increased, but remains entire in His substance.
This sublime mystery St. Ambrose thus declares: You see how efficacious are the words of Christ. If the word of the Lord Jesus is so powerful as to summon into existence that which did not exist, namely the world, how much more powerful is His word to change into something else that which already has existence ? Many other ancient and most authoritative Fathers have written to the same effect. We faithfully confess, says St. Augustine, that before consecration it is bread and wine, the product of nature; but after consecration it is the body and blood of Christ, consecrated by the blessing. The body, says Damascene, is truly united to the Divinity, that body which was derived from the virgin; not that the body thus derived descends from heaven, but that the bread and wine are changed into the body and blood of Christ.
This admirable change, as the Council of Trent teaches, the Holy Catholic Church most appropriately expresses by the word transubstantiation. Since natural changes are rightly called transformations, because they involve a change of form; so likewise our predecessors in the faith wisely and appropriately introduced the term transubstantiation, in order to signify that in the Sacrament of the Eucharist the whole substance of one thing passes into the whole substance of another.
According to the admonition so frequently repeated by the holy Fathers, the faithful are to be admonished against curious searching into the manner in which this change is effected. It defies the powers of conception; nor can we find any example of it in natural transmutations, or even in the very work of creation. That such a change takes place must be recognised by faith; how it takes place we must not curiously inquire. No less of caution should be observed by pastors in explaining the mysterious manner in which the body of our Lord is contained whole and entire under the least particle of the bread. Indeed, discussions of this kind should scarcely ever be entered upon. Should Christian charity, however, require a departure from this rule, the pastor should remember first of all to prepare and fortify his hearers by reminding them that no word shall be impossible with God.