Thomas Aquinas

“ 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. ”

“ He who is not baptized, though he belongs not to the Church either in reality or sacramentally, can nevertheless belong to her in intention and by similarity of action, namely, in so far as he intends to do what the Church does, and in baptizing observes the Church's form, and thus acts as the minister of Christ, Who did not confine His power to those that are baptized, as neither did He to the sacraments. ”

“ Now, in carnal generation the new-born child needs nourishment and guidance: wherefore, in spiritual generation also, someone is needed to undertake the office of nurse and tutor by forming and instructing one who is yet a novice in the Faith, concerning things pertaining to Christian faith and mode of life, which the clergy have not the leisure to do through being busy with watching over the people generally: because little children and novices need more than ordinary care. ”

“ In carnal generation nothing is essential besides a father and a mother: yet to ease the latter in her travail, there is need for a midwife; and for the child to be suitably brought up there is need for a nurse and a tutor: while their place is taken in Baptism by him who raises the child from the sacred font. Consequently this is not essential to the sacrament, and in a case of necessity one alone can baptize with water. ”

“ When Baptism is celebrated solemnly and with due form, it should be conferred by a priest having charge of souls, or by one representing him. But this is not required in cases of urgency, when a woman may baptize.
Reply to Objection 3: In carnal generation male and female co-operate according to the power of their proper nature; wherefore the female cannot be the active, but only the passive, principle of generation. But in spiritual generation they do not act, either of them, by their proper power, but only instrumentally by the power of Christ. ”

“ 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. ”

“ Hence Isidore says (Epist. ad Ludifred.) : "It is a deacon's duty to assist and serve the priests, in all the rites of Christ's sacraments, viz. those of Baptism, of the Chrism, of the Paten and Chalice."
Reply to Objection 1: It is the deacon's duty to read the Gospel in church, and to preach it as one catechizing; hence Dionysius says (Eccl. Hier. v) that a deacon's office involves power over the unclean among whom he includes the catechumens. But to teach, i.e. to expound the Gospel, is the proper office of a bishop, whose action is "to perfect," as Dionysius teaches (Eccl. Hier. v) ”

“ Moreover, by Baptism a man becomes a participator in ecclesiastical unity, wherefore also he receives the right to approach our Lord's Table. Consequently, just as it belongs to a priest to consecrate the Eucharist, which is the principal purpose of the priesthood, so it is the proper office of a priest to baptize: since it seems to belong to one and the same, to produce the whole and to dispose the part in the whole.
Reply to Objection 1: Our Lord enjoined on the apostles, whose place is taken by the bishops, both duties, namely, of teaching and of baptizing, but in different ways. ”

“ Just as a woman is not suffered to teach in public, but is allowed to instruct and admonish privately; so she is not permitted to baptize publicly and solemnly, and yet she can baptize in a case of urgency. ”

“ Nevertheless an unbaptized person cannot be a godparent, as was decreed in the Council of Mainz, although an unbaptized person: because the person baptizing is essential to the sacrament, wherefore as the godparent is not, as stated above (A [7] , ad 2) .
Reply to Objection 2: Just as spiritual generation is distinct from carnal generation, so is spiritual education distinct from that of the body; according to Heb. 12:9: "Moreover we have had fathers of our flesh for instructors, and we reverenced them: shall we not much more obey the Father of Spirits, and live?" ”

“ But in no case is a woman allowed to teach in church, according to 1 Cor. 14:35: "It is a shame for a woman to speak in the church." Therefore it seems that neither is a woman in any circumstances permitted to baptize. ”

“ In every commonwealth minor affairs are entrusted to lower officials, while greater affairs are restricted to higher officials; according to Ex. 18:22: "When any great matter soever shall fall out, let them refer it to thee, and let them judge the lesser matters only." ”