“It is an excellent thing that the Punic [North African] Christians call baptism salvation and the sacrament of Christ’s body nothing else than life. Whence does this derive, except from an ancient and, as I suppose, apostolic tradition, by which the churches of Christ hold inherently that without baptism and participation at the table of the Lord it is impossible for any man to attain either to the kingdom of God or to salvation and life eternal? This is the witness of Scripture too” (Forgiveness and the Just Deserts of Sin, and the Baptism of Infants 1:24:34 [A.D. 412]).
“The sacrament of baptism is most assuredly the sacrament of regeneration” (ibid., 2:27:43).
“Baptism washes away all, absolutely all, our sins, whether of deed, word, or thought, whether sins original or added, whether knowingly or unknowingly contracted” (Against Two Letters of the Pelagians 3:3:5 [A.D. 420]).
“This is the meaning of the great sacrament of baptism, which is celebrated among us: all who attain to this grace die thereby to sin—as he himself [Jesus] is said to have died to sin because he died in the flesh (that is, ‘in the likeness of sin’)—and they are thereby alive by being reborn in the baptismal font, just as he rose again from the sepulcher. This is the case no matter what the age of the body. For whether it be a newborn infant or a decrepit old man—since no one should be barred from baptism—just so, there is no one who does not die to sin in baptism. Infants die to original sin only; adults, to all those sins which they have added, through their evil living, to the burden they brought with them at birth” (Handbook on Faith, Hope, and Love 13 [A.D. 421]).