Acts 19:4

Then said Paul, John . . . baptized with the baptism of repentance--water unto repentance. saying unto the people, that they should believe on him which should come after him--that is, who should baptize with the Holy Ghost. The point of contrast is not between John and Christ personally, but between the water baptism of John unto repentance, and the promised baptism of the Spirit from the hands of his coming Master unto new life. As to all the facts, or at least the significancy, of this baptism, which made the whole life and work of Christ another thing from what it was conceived to be before it was vouchsafed, these simple disciples were unenlightened.

We left Paul in his circuit visiting the churches (Act 18:23), but we have not forgotten, nor has he, the promise he made to his friends at Ephesus, to return to them, and make some stay there; now this chapter shows us his performance of that promise, his coming to Ephesus, and his continuance there two years; we are here told, I. How he laboured there in the word and doctrine, how he taught some weak believers that had gone no further than John's baptism (Act 19:1-7), how he taught three months in the synagogue of the Jews (Act 19:8), and, when he was driven thence, how he taught the Gentiles a long time in a public school (Act 19:9, Act 19:10), and how he confirmed his doctrine by miracles (Act 19:11, Act 19:12). II. What was the fruit of his labour, particularly among the conjurors, the worst of sinners: some were confounded, that did but make use of his name (Act 19:13-17), but others were converted, that received and embraced his doctrine (Act 19:18-20). III. What projects he had of further usefulness (Act 19:21, Act 19:22), and what trouble at length he met with at Ephesus from the silversmiths, which forced him thence to pursue the measures he had laid; how a mob was raised by Demetrius to cry up Diana (Act 19:23-34), and how it was suppressed and dispersed by the town-clerk (Act 19:35-41).