Again the words “Verily, verily” (comp. Note on chap John 1:51), calling attention to the deeper truth which follows; and again the words of authority, “I say unto thee.”
Of water and of the Spirit. — We are here on the borderland of a great controversy. The subject is closely connected with that of the discourse in Capernaum (John 6), and so far as it is a subject for the pages of a Commentary at all, it will be better to treat of it in connection with that discourse. (See Excursus C: The Sacramental Teaching of St. John’s Gospel.) Our task here is to ask what meaning the words were intended by the Speaker to convey to the hearer; and this seems not to admit of doubt. The baptism of proselytes was already present to the thought; the baptism of John had excited the attention of all Jerusalem, and the Sanhedrin had officially inquired into it. Jesus Himself had submitted to it, but “the Pharisees and lawyers” [Nicodemus was both] “rejected the counsel of God against themselves, being not baptised of him” (Luke 7:29). The key to the present verse is found in the declaration of John, “I baptise with water... He baptiseth with the Holy Ghost” (John 1:26; John 1:33), and this key must have been then in the mind of Nicodemus. The message was, baptism with water; baptism with water, by which the Gentile had been admitted as a new-born babe to Judaism, the rite representing the cleansing of the life from heathen pollutions and devotion to the service of the true God; baptism with water, which John had preached in his ministry of reformation (comp. Matthew 3:7), declaring a like cleansing as needed for Jew and Gentile, Pharisee and publican, as the gate to the kingdom of heaven, which was at hand; baptism with water, which demanded a public profession in the presence of witnesses, and an open loyalty to the new kingdom, not a visit by night, under the secrecy of darkness — this is the message of God to the teacher seeking admission to His kingdom. This he would understand. It would now be clear to him why John came baptising, and why Jews were themselves baptised confessing their sins. There is no further explanation of the “outward and visible sign,” but the teaching passes on to the “inward and spiritual grace,” the baptism of the Holy Ghost, the birth of the Spirit, which was the work of the Messiah Himself. Of this, indeed, there were foreshadowings and promises in the Old Testament Scriptures (comp., e.g., Ezekiel 36:25 et seq.; Jeremiah 31:33; Joel 2:28); but the deeper meaning of such passages was buried beneath the ruins of the schools of prophets, and few among later teachers had penetrated to it. It is hard for this Rabbi to see it, even when it is brought home to him.
(5) It is believed that the rendering adopted agrees with the whole context, and gives a fuller sense to the words of the great Teacher.