Q: Whether Trine Immersion Is Essential to Baptism?

A: On the contrary,
Gregory wrote to the Bishop Leander: "It cannot be in any way reprehensible to baptize an infant with either a trine or a single immersion: since the Trinity can be represented in the three immersions, and the unity of the Godhead in one immersion."

I answer that As stated above (A. 7, ad 1), washing with water is of itself required for Baptism, being essential to the sacrament: whereas the mode of washing is accidental to the sacrament. Consequently, as Gregory in the words above quoted explains, both single and trine immersion are lawful considered in themselves; since one immersion signifies the oneness of Christ's death and of the Godhead; while trine immersion signifies the three days of Christ's burial, and also the Trinity of Persons.

But for various reasons, according as the Church has ordained, one mode has been in practice, at one time, the other at another time. For since from the very earliest days of the Church some have had false notions concerning the Trinity, holding that Christ is a mere man, and that He is not called the "Son of God" or "God" except by reason of His merit, which was chiefly in His death; for this reason they did not baptize in the name of the Trinity, but in memory of Christ's death, and with one immersion. And this was condemned in the early Church. Wherefore in the Apostolic Canons (xlix) we read: "If any priest or bishop confer baptism not with the trine immersion in the one administration, but with one immersion, which baptism is said to be conferred by some in the death of the Lord, let him be deposed": for our Lord did not say, "Baptize ye in My death," but "In the name of the Father and of the Son, and of the Holy Ghost."

Later on, however, there arose the error of certain schismatics and heretics who rebaptized: as Augustine (Super. Joan., cf. De Haeres. lxix) relates of the Donatists. Wherefore, in detestation of their error, only one immersion was ordered to be made, by the (fourth) council of Toledo, in the acts of which we read: "In order to avoid the scandal of schism or the practice of heretical teaching let us hold to the single baptismal immersion."

But now that this motive has ceased, trine immersion is universally observed in Baptism: and consequently anyone baptizing otherwise would sin gravely, through not following the ritual of the Church. It would, however, be valid Baptism.

Reply Obj. 1: The Trinity acts as principal agent in Baptism. Now the likeness of the agent enters into the effect, in regard to the form and not in regard to the matter. Wherefore the Trinity is signified in Baptism by the words of the form. Nor is it essential for the Trinity to be signified by the manner in which the matter is used; although this is done to make the signification clearer.

In like manner Christ's death is sufficiently represented in the one immersion. And the three days of His burial were not necessary for our salvation, because even if He had been buried or dead for one day, this would have been enough to consummate our redemption: yet those three days were ordained unto the manifestation of the reality of His death, as stated above (Q. 53, A. 2). It is therefore clear that neither on the part of the Trinity, nor on the part of Christ's Passion, is the trine immersion essential to the sacrament.

Reply Obj. 2: Pope Pelagius understood the trine immersion to be ordained by Christ in its equivalent; in the sense that Christ commanded Baptism to be conferred "in the name of the Father, and of the Son, and of the Holy Ghost." Nor can we argue from the form to the use of the matter, as stated above (ad 1).

Reply Obj. 3: As stated above (Q. 64, A. 8), the intention is essential to Baptism. Consequently, one Baptism results from the intention of the Church's minister, who intends to confer one Baptism by a trine immersion. Wherefore Jerome says on Eph. 4:5, 6: "Though the Baptism," i.e. the immersion, "be thrice repeated, on account of the mystery of the Trinity, yet it is reputed as one Baptism."

If, however, the intention were to confer one Baptism at each immersion together with the repetition of the words of the form, it would be a sin, in itself, because it would be a repetition of Baptism.