1. The principal stress is laid by Christ upon the second part of the requirement — namely, the spiritual birth. This is evident from the omission of all reference to baptism in Isa_48:6; Isa_48:8.
2. The language of Isa_48:5 can, at most, only mean that baptism and regeneration are both essential, but not necessarily in the same sense or to the same degree; certainly not that they are identical, nor that one implies the other. The phraseology positively forbids such a confusion of the two.
3. The association herb of baptism with a spiritual change is no more emphatic than in several other passages similarly laying down the conditions of Christianity — e.g. “Teach all nations, baptizing them” (Mat_28:19); “He that believeth and is baptized shall be saved” (Mar_16:16; but note the omission in the clause following, “He that believeth not shall be damned”); “Repent and be baptized every one of you” (Act_2:38); “Arise and be baptized, and wash away thy sins” (22:16).
4. Our Lord himself dispensed with baptism in the admission of at least one member into his kingdom, namely, the dying thief (Luk_23:42-43).
5. Christ certainly does mean to attach importance to water-baptism as an initiative rite into his Church or kingdom. The body of believers exists under two aspects, the visible and the invisible — the outward or nominal, and the inward or real. Baptism is as imperative a mark of admission to the former as spiritual new birth is to entrance into the latter. In order to full recognition as a member of both, the two acts are truly essential. This doctrine, which orthodox ecclesiastics have always maintained, is thus strictly in accordance with the tenor of the text in question.
On the dogma of baptismal regeneration, see the Bibliotheca Sacra, April; 1876; Prot. Episc. Quar. Rev. Oct. 1860; Meth. Quar. Rev. Oct. 1854.