Mark 1:4

(in Marc. i. 2) It is evident that John not only preached, but also gave to some the baptism of repentance; but he could not give baptism for the remission of sinsc. For remission of sins is only given to us by the baptism of Christ. It is therefore only said, Preaching the baptism of repentance for the remission of sins; for he preached a baptism which could remit sins, since he could not give it. Wherefore as he was the forerunner of the Incarnate Word of the Father, by the word of his preaching, so by his baptism, which could not remit sins, he preceded that baptism, of penitence, by which sins are remitted.

The baptism of John had not remission of sins, but only brought men to penitence. He preached therefore the baptism of repentance, that is, he preached that to which the baptism of penitence led, namely, remission of sins, that they who in penitence received Christ, might receive Him to the remission of their sins.

According to the above-mentioned prophecy of Isaiah, the way of the Lord is prepared by John, through faith, baptism, and penitence; the paths are made straight by the rough marks of the hair-cloth garment, the girdle of skin, the feeding on locusts and wild honey, and the most lowly voice; whence it is said, John was in the wilderness. For John and Jesus seek what is lost in the wilderness; where the devil conquered, there he is conquered; where man fell, there he rises up. But the name John means the grace of God, and the narrative begins with grace. For it goes on to say, baptizing. For by baptism grace is given, seeing that by baptism sins are freely remitted. But what is brought to perfection by the bridegroom, is introduced by the friend of the bridegroom. Thus catechumens, (which word means persons instructed,) begin by the ministry of the priest, receive the chrismb from the bishop. And to show this, it is subjoined, And preaching the baptism of repentance, &c.