The point to be observed, however, is this, that by this form, "We baptize thee," the intention expressed is that several concur in conferring one Baptism: and this seems contrary to the notion of a minister; for a man does not baptize save as a minister of Christ, and as standing in His place; wherefore just as there is one Christ, so should there be one minister to represent Christ. Hence the Apostle says pointedly (Eph. 4:5): "one Lord, one Faith, one Baptism." Consequently, an intention which is in opposition to this seems to annul the sacrament of Baptism.
On the other hand, if each were to say: "I baptize thee in the name of the Father and of the Son and of the Holy Ghost," each would signify his intention as though he were conferring Baptism independently of the other. This might occur in the case where both were striving to baptize someone; and then it is clear that whichever pronounced the words first would confer the sacrament of Baptism; while the other, however great his right to baptize, if he presume to utter the words, would be liable to be punished as a rebaptizer. If, however, they were to pronounce the words absolutely at the same time, and dipped or sprinkled the man together, they should be punished for baptizing in an improper manner, but not for rebaptizing: because each would intend to baptize an unbaptized person, and each, so far as he is concerned, would baptize. Nor would they confer several sacraments: but the one Christ baptizing inwardly would confer one sacrament by means of both together.
Reply Obj. 1: This argument avails in those agents that act by their own power. But men do not baptize by their own, but by Christ's power, Who, since He is one, perfects His work by means of one minister.
Reply Obj. 2: In a case of necessity one could baptize several at the same time under this form: "I baptize ye": for instance, if they were threatened by a falling house, or by the sword or something of the kind, so as not to allow of the delay involved by baptizing them singly. Nor would this cause a change in the Church's form, since the plural is nothing but the singular doubled: especially as we find the plural expressed in Matt. 28:19: "Baptizing them," etc. Nor is there parity between the baptizer and the baptized; since Christ, the baptizer in chief, is one: while many are made one in Christ by Baptism.
Reply Obj. 3: As stated above (Q. 66, A. 1), the integrity of Baptism consists in the form of words and the use of the matter. Consequently, neither he who only pronounces the words, baptizes, nor he who dips. Wherefore if one pronounces the words and the other dips, no form of words can be fitting. For neither could he say: "I baptize thee": since he dips not, and therefore baptizes not. Nor could they say: "We baptize thee": since neither baptizes. For if of two men, one write one part of a book, and the other write the other, it would not be a proper form of speech to say: "We wrote this book," but the figure of synecdoche in which the whole is put for the part. _______________________
SEVENTH ARTICLE [III, Q. 67, Art. 7]
Whether in Baptism It Is Necessary for Someone to Raise the Baptized from the Sacred Font?
Objection 1: It seems that in Baptism it is not necessary for someone to raise the baptized from the sacred font. For our Baptism is consecrated by Christ's Baptism and is conformed thereto. But Christ when baptized was not raised by anyone from the font, but according to Matt. 3:16, "Jesus being baptized, forthwith came out of the water." Therefore it seems that neither when others are baptized should anyone raise the baptized from the sacred font.
Obj. 2: Further, Baptism is a spiritual regeneration, as stated above (A. 3). But in carnal generation nothing else is required but the active principle, i.e. the father, and the passive principle, i.e. the mother. Since, then, in Baptism he that baptizes takes the place of the father, while the very water of Baptism takes the place of the mother, as Augustine says in a sermon on the Epiphany (cxxxv); it seems that there is no further need for someone to raise the baptized from the sacred font.
Obj. 3: Further, nothing ridiculous should be observed in the sacraments of the Church. But it seems ridiculous that after being baptized, adults who can stand up of themselves and leave the sacred font, should be held up by another. Therefore there seems no need for anyone, especially in the Baptism of adults, to raise the baptized from the sacred font.