is appropriate?

(4) Of the power of each form?

(5) Of the truth of the expression?

(6) Of the comparison of the one form with the other?
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FIRST ARTICLE [III, Q. 78, Art. 1]

Whether This Is the Form of This Sacrament: "This Is My Body," and
"This Is the Chalice of My Blood"?

Objection 1: It seems that this is not the form of this sacrament:
"This is My body," and, "This is the chalice of My blood." Because
those words seem to belong to the form of this sacrament, wherewith
Christ consecrated His body and blood. But Christ first blessed the
bread which He took, and said afterwards: "Take ye and eat; this is
My body" (Matt. 26:26). Therefore the whole of this seems to belong
to the form of this sacrament: and the same reason holds good of the
words which go with the consecration of the blood.

Obj. 2: Further, Eusebius Emissenus (Pseudo-Hieron: Ep. xxix;
Pseudo-Isid.: Hom. iv) says: "The invisible Priest changes visible
creatures into His own body, saying: 'Take ye and eat; this is My
body.'" Therefore, the whole of this seems to belong to the form of
this sacrament: and the same hold good of the works appertaining to
the blood.

Obj. 3: Further, in the form of Baptism both the minister and his act
are expressed, when it is said, "I baptize thee." But in the words
set forth above there is no mention made either of the minister or of
his act. Therefore the form of the sacrament is not a suitable one.

Obj. 4: Further, the form of the sacrament suffices for its
perfection; hence the sacrament of Baptism can be performed sometimes
by pronouncing the words of the form only, omitting all the others.
Therefore, if the aforesaid words be the form of this sacrament, it
would seem as if this sacrament could be performed sometimes by
uttering those words alone, while leaving out all the others which
are said in the mass; yet this seems to be false, because, were the
other words to be passed over, the said words would be taken as
spoken in the person of the priest saying them, whereas the bread and
wine are not changed into his body and blood. Consequently, the
aforesaid words are not the form of this sacrament.

_On the contrary,_ Ambrose says (De Sacram. iv): "The consecration is
accomplished by the words and expressions of the Lord Jesus. Because,
by all the other words spoken, praise is rendered to God, prayer is
put up for the people, for kings, and others; but when the time comes
for p