This was practised by the Seleucians, the Herminians, and some others. The words, "He shall baptize you with fire," have never been explained. There are several opinions concerning the baptism by fire which is mentioned by St. Luke and St. Matthew. Perhaps the most likely opinion is that it was an allusion to the ancient custom of the devotees to the Syrian goddess, who, after plunging into water, imprinted characters on their bodies with a hot iron. With miserable man all was superstition, but Jesus substituted for these ridiculous superstitions a sacred ceremony—a divine and efficacious symbol.
In the first ages of Christianity nothing was more common than to postpone the receiving of baptism until the last agony. Of this the example of the Emperor Constantine is a very strong proof. St. Andrew had not been baptized when he was made bishop of Milan. The custom of deferring the use of the sacred bath until the hour of death was soon abolished.
Baptism of the Dead.
The dead also were baptized. This is established by the passage of St. Paul to the Corinthians: "If we rise not again what shall they do that receive baptism from the dead?" Here is a point of fact. Either the dead themselves were baptized, or baptism was received in their names, as indulgences have since been received for the deliverance of the souls of friends and relatives out of purgatory.
St. Epiphanius and St. Chrysostom inform us that it was a custom in some Christian societies, and principally among the Marcionites, to put a living man under the dead man's bed; he was then asked if he would be baptized; the living man answered yes, and the corpse was taken and plunged into a tub of water. This custom was soon condemned. St. Paul mentions it but he does not condemn it; on the contrary he cites it as an invincible argument to prove resurrection.
Baptism by Aspersion.
The Greeks always retained baptism by immersion. The Latins, about the close of the eighth century, having extended their religion into Gaul and Germany and seeing that immersion might be fatal to infants in cold countries, substituted simple aspersion and thus drew upon themselves frequent anathemas from the Greek Church.
St. Cyprian, bishop of Carthage, was asked if those were really baptized who had only had their bodies sprinkled all over. He answers, in his seventy-sixth letter, that several churches did not believe the sprinkled to be Christians; that, for his own part, he believes that they are so, but that they have infinitely less grace than those who have been thrice dipped, according to custom.
A person was initiated among the Christians as soon as he was dipped; until then he was only a catechumen. To be initiated it was necessary to have sponsors to answer to the Church for the fidelity of the new Christians and that the mysteries should not be divulged. Hence it was that in the first ages the Gentiles had, in general, as little knowledge of the Christian mysteries as the Christians had of the mysteries of Isis and the Eleusinian Ceres.
Cyril of Alexandria, in his writing against the Emperor Julian, expresses himself thus: "I would speak of baptism but that I fear my words would reach them who are not initiated." At that time there was no worship without its mysteries, its associations, its catechumens, its initiated, and its professed. Each sect required new virtues and recommended to its penitents a new life—"initium novæ vitæ"—whence the word initiation. The initiation of Christians, whether male or female, consisted in their being plunged quite naked into a tub of cold water, to which sign was attached the remission of all their sins. But the difference between Christian baptism and the Greek, Syrian, Egyptian, and Roman ceremonies was the difference between truth and falsehood. Jesus Christ was the High Priest of the new law.