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Roman Catechism
Form To Be Used In The Consecration Of The Bread
We are then taught by the holy Evangelists, Matthew and Luke, and also by the Apostle, that the form consists of these words: This is my body; for it is written: Whilst they were at supper, Jesus took bread, and blessed it, and brake, and gave to his disciples, and said: Take and eat, This is my body.
This form of consecration having been observed by Christ the Lord has been always used by the Catholic Church. The testimonies of the Fathers, the enumeration of which would be endless, and also the decree of the Council of Florence, which is well known and accessible to all, must here be omitted, especially as the knowledge which they convey may be obtained from these words of the Saviour: Do this for a commemoration of me. For what the Lord enjoined was not only what He had done, but also what he had said; and especially is this true, since the words were uttered not only to signify, but also to accomplish.
That these words constitute the form is easily proved from reason also. The form is that which signifies what is accomplished in this Sacrament; but as the preceding words signify and declare what takes place in the Eucharist, that is, the conversion of the bread into the true body of our Lord, it therefore follows that these very words constitute the form. In this sense may be understood the words of the Evangelist: He blessed; for they seem equivalent to this: Taking bread, he blessed it, saying: “This is my body".