677. IV. THE FIRST USE OF BAPTISM IS INTRODUCTION INTO THE CHRISTIAN CHURCH, AND AT THE SAME TIME INSERTION AMONG CHRISTIANS IN THE SPIRITUAL WORLD.
That baptism is introduction into the Christian church is evident from many considerations, such as the following:
(i.) Baptism was instituted in the place of circumcision; and as circumcision was a sign that those circumcised were of the Israelitish church, so is baptism a sign that those baptized are of the Christian church, as shown in the preceding section; and a sign is nothing more than a means of recognition, just as swaddling clothes of different colors are put on the children of two mothers, to distinguish them and prevent their being changed. (ii.)  That it is merely a sign of introduction into the church, is made clear by the baptizing of infants, who are wholly destitute of reason and are no more able to receive anything pertaining to faith than the young branches of a tree. (iii. )  Not only are infants baptized but all foreign proselytes who are converted to the Christian religion, both the young and the old, and this before they have been instructed, solely because they confess a wish to embrace Christianity, into which they are introduced by baptism, this same having been done by the apostles, according to the Lord's command,
That the disciples should make disciples of all nations, and baptize them (Matt. 28:19).
(iv.)  Again:
John baptized in Jordan all who came to him from Judea and Jerusalem (Matt. 3:5, 6; Mark 1:5).
He baptized in Jordan for the reason that entrance into the land of Canaan was through that river, and "the land of Canaan" signified the church, because the church was there; and so "the Jordan" signified introduction into the church That "the land of Canaan" signified the church, and "the Jordan" introduction into it, may be seen in the Apocalypse Revealed (n. 285).
 All this, however, is what takes place on earth. But in the heavens infants are introduced by baptism into the Christian heaven, and angels are there assigned them by the Lord, to take care of them. Therefore as soon as infants are baptized, angels are appointed over them, by whom they are kept in a state to receive faith in the Lord; but as they grow up, and begin to exercise self-control and be governed by their own reason, these guardian angels leave them, and they draw into association with themselves such spirits as make one with their life and faith. From all this it is clear that baptism is insertion among Christians in the spiritual world also.