Reply Obj. 1: Baptism derives its efficacy from Christ's Passion, as stated above (A. 2, ad 1). Wherefore, just as subsequent sins do not cancel the virtue of Christ's Passion, so neither do they cancel Baptism, so as to call for its repetition. On the other hand the sin which hindered the effect of Baptism is blotted out on being submitted to Penance.
Reply Obj. 2: As Augustine says on John 1:33: "'And I knew Him not': Behold; after John had baptized, Baptism was administered; after a murderer has baptized, it is not administered: because John gave his own Baptism; the murderer, Christ's; for that sacrament is so sacred, that not even a murderer's administration contaminates it."
Reply Obj. 3: The Paulianists and Cataphrygians used not to baptize in the name of the Trinity. Wherefore Gregory, writing to the Bishop Quiricus, says: "Those heretics who are not baptized in the name of the Trinity, such as the Bonosians and Cataphrygians" (who were of the same mind as the Paulianists), "since the former believe not that Christ is God" (holding Him to be a mere man), "while the latter," i.e. the Cataphrygians, "are so perverse as to deem a mere man," viz. Montanus, "to be the Holy Ghost: all these are baptized when they come to holy Church, for the baptism which they received while in that state of error was no Baptism at all, not being conferred in the name of the Trinity." On the other hand, as set down in De Eccles. Dogm. xxii: "Those heretics who have been baptized in the confession of the name of the Trinity are to be received as already baptized when they come to the Catholic Faith."
Reply Obj. 4: According to the Decretal of Alexander III: "Those about whose Baptism there is a doubt are to be baptized with these words prefixed to the form: 'If thou art baptized, I do not rebaptize thee; but if thou art not baptized, I baptize thee,' etc.: for that does not appear to be repeated, which is not known to have been done."
Reply Obj. 5: Both sacraments, viz. Baptism and the Eucharist, are a representation of our Lord's death and Passion, but not in the same way. For Baptism is a commemoration of Christ's death in so far as man dies with Christ, that he may be born again into a new life. But the Eucharist is a commemoration of Christ's death, in so far as the suffering Christ Himself is offered to us as the Paschal banquet, according to 1 Cor. 5:7, 8: "Christ our pasch is sacrificed; therefore let us feast." And forasmuch as man is born once, whereas he eats many times, so is Baptism given once, but the Eucharist frequently. _______________________
TENTH ARTICLE [III, Q. 66, Art. 10]
Whether the Church Observes a Suitable Rite in Baptizing?
Objection 1: It seems that the Church observes an unsuitable rite in baptizing. For as Chrysostom (Chromatius, in Matth. 3:15) says: "The waters of Baptism would never avail to purge the sins of them that believe, had they not been hallowed by the touch of our Lord's body." Now this took place at Christ's Baptism, which is commemorated in the Feast of the Epiphany. Therefore solemn Baptism should be celebrated at the Feast of the Epiphany rather than on the eves of Easter and Whitsunday.
Obj. 2: Further, it seems that several matters should not be used in the same sacrament. But water is used for washing in Baptism. Therefore it is unfitting that the person baptized should be anointed thrice with holy oil first on the breast, and then between the shoulders, and a third time with chrism on the top of the head.
Obj. 3: Further, "in Christ Jesus . . . there is neither male nor female" (Gal. 3:23) . . . "neither Barbarian nor Scythian" (Col. 3:11), nor, in like manner, any other such like distinctions. Much less, therefore can a difference of clothing have any efficacy in the Faith of Christ. It is consequently unfitting to bestow a white garment on those who have been baptized.