c. 198–203 · Tertullian, On Baptism (De baptismo) 10
The baptism announced by John formed the subject, even at that time, of a question, proposed by the Lord Himself indeed to the Pharisees, whether that baptism were heavenly, or truly earthly: about which they were unable to give a consistent answer, inasmuch as they understood not, because they believed not. But we, with but as poor a measure of understanding as of faith, are able to determine that that baptism was divine indeed, (yet in respect of the command, not in respect of efficacy too, in that we read that John was sent by the Lord to perform this duty,) but human in its nature: for it conveyed nothing celestial, but it fore-ministered to things celestial; being, to wit, appointed over repentance, which is in man’s power. In fact, the doctors of the law and the Pharisees, who were unwilling to “believe,” did not “repent” either. But if repentance is a thing human, its baptism must necessarily be of the same nature: else, if it had been celestial, it would have given both the Holy Spirit and remission of sins. But none either pardons sins or freely grants the Spirit save God only. Even the Lord Himself said that the Spirit would not descend on any other condition, but that He should first ascend to the Father. What the Lord was not yet conferring, of course the servant could not furnish. Accordingly, in the Acts of the Apostles, we find that men who had “John’s baptism” had not received the Holy Spirit, whom they knew not even by hearing.