Thomas Aquinas

“ 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.
Art. 10 - Whether the Church observes a suitable rite in baptizing? ”

“ The shedding of blood is not in the nature of a Baptism if it be without charity. Hence it is clear that the Baptism of Blood includes the Baptism of the Spirit, but not conversely. And from this it is proved to be more perfect. ”

“ What is accidental to a thing does not diversify its essence. Now bodily washing with water is essential to Baptism: wherefore Baptism is called a "laver," according to Eph. 5:26: "Cleansing it by the laver of water in the word of life." But that the washing be done this or that way, is accidental to Baptism. And consequently such diversity does not destroy the oneness of Baptism.
Reply to Objection 2: Christ's burial is more clearly represented by immersion: wherefore this manner of baptizing is more frequently in use and more commendable. ”

“ I answer that, As stated above ( [4428] Q [62] , A [5] ) , Baptism of Water has its efficacy from Christ's Passion, to which a man is conformed by Baptism, and also from the Holy Ghost, as first cause. Now although the effect depends on the first cause, the cause far surpasses the effect, nor does it depend on it. Consequently, a man may, without Baptism of Water, receive the sacramental effect from Christ's Passion, in so far as he is conformed to Christ by suffering for Him. ”

“ The candidate is anointed on the breast, in order to receive the gift of the Holy Ghost, to cast off error and ignorance, and to acknowledge the true faith, since 'the just man liveth by faith'; while he is anointed between the shoulders, that he may be clothed with the grace of the Holy Ghost, lay aside indifference and sloth, and become active in good works; so that the sacrament of faith may purify the thoughts of his heart, and strengthen his shoulders for the burden of labor. ”

“ In like manner a man receives the effect of Baptism by the power of the Holy Ghost, not only without Baptism of Water, but also without Baptism of Blood: forasmuch as his heart is moved by the Holy Ghost to believe in and love God and to repent of his sins: wherefore this is also called Baptism of Repentance. ”

“ Yet in the other ways of baptizing it is represented after a fashion, albeit not so clearly; for no matter how the washing is done, the body of a man, or some part thereof, is put under water, just as Christ's body was put under the earth. ”

“ Or we may understand it to mean tribulation, as Chrysostom says (Hom. iii in Matth.) : because tribulation washes away sin, and tempers concupiscence. Or again, as Hilary says (Super Matth. ii) that "when we have been baptized in the Holy Ghost," we still have to be "perfected by the fire of the judgment." ”

“ Fourthly, because by being so universal and abundant, it is a matter suitable to our need of this sacrament: for it can easily be obtained everywhere.
Reply to Objection 1: Fire enlightens actively. But he who is baptized does not become an enlightener, but is enlightened by faith, which "cometh by hearing" (Rom. 10:17) . Consequently water is more suitable, than fire, for Baptism. ”

“ Therefore solemn Baptism should be celebrated at the Feast of the Epiphany rather than on the eves of Easter and Whitsunday.
Objection 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.
Objection 3: Further, "in Christ Jesus . . . there is neither male nor female" (Gal. 3:23) . ”

“ The words which are uttered in the sacramental forms, are said not merely for the purpose of signification, but also for the purpose of efficiency, inasmuch as they derive efficacy from that Word, by Whom "all things were made." Consequently they are becomingly addressed not only to men, but also to insensible creatures ”