Acts XVIII. 18
“And Paul after this tarried there yet a good while, and then took his leave of the brethren, and sailed thence into Syria, and with him Priscilla and Aquila; having shorn his head in Cenchrea: for he had a vow.”
See how the Law was breaking up; see how they were bound by conscience. This, namely, was a Jewish custom, to shear their heads agreeably with a vow. But then there ought to be also a sacrifice, which was not the case here. — “Having yet tarried:” after the beating of Sosthenes. For it was necessary that he should yet tarry, and comfort them concerning these things. “He sailed for Syria.” Why does he desire again to come to Syria? It was there that “the disciples were ordered to be called Christians”: there, that he had been “commended to the grace of God”: there, that he had effected such things concerning the doctrine. “And with him Priscilla”— lo, a woman also — “and Aquila.” But these he left at Ephesus. With good reason, namely, that they should teach. For having been with him so long time, they were learning many things: and yet he did not at present withdraw them from their custom as Jews. “And he came to Ephesus, and left them there: but he himself entered into the synagogue, and reasoned with the Jews. When they desired him to tarry longer time with them, he consented not; but bade them farewell, saying, I must by all means keep this feast that comes in Jerusalem.” Therefore it was that he was hindered from coming into Asia, being impelled to what was of pressing moment. Thus observe him here, entreated (by them) to stay, but because he could not comply, being in haste to depart, “he bade them farewell.” However, he did not leave them without more ado, but with promise (to return): “But I will return again unto you, if God will. And he sailed from Ephesus.” “And when he had landed at Cæsarea, and gone up, and saluted the Church, he went down to Antioch. And after he had spent some time there, he departed, and went over all the country of Galatia and Phrygia in order, strengthening all the disciples.” He came again to those places which he had previously visited. “And a certain Jew named Apollos, born at Alexandria, an eloquent man, and mighty in the Scriptures, came to Ephesus.” Lo, even learned men are now urgent, and the disciples henceforth go abroad. Do you mark the spread of the preaching? “This man was instructed in the way of the Lord; and being fervent in the Spirit, he spoke and taught diligently the things of the Lord, knowing only the baptism of John. And he began to speak boldly in the synagogue: whom when Aquila and Priscilla had heard, they took him unto them, and expounded unto him the way of God more perfectly.” If this man knew only the baptism of John, how is it that he was “fervent in the Spirit,” for the Spirit was not given in that way? And if those after him needed the baptism of Christ, much more would he need it. Then what is to be said? For it is not without a meaning that the writer has strung the two incidents together. It seems to me that this was one of the hundred and twenty who were baptized with the Apostles: or, if not so, then the same that took place in the case of Cornelius, took place also in the case of this man. But neither does he receive baptism. That expression, then, “they expounded more perfectly,” seems to me to be this, that he behooved also to be baptized. Because the other twelve knew nothing accurate, not even what related to Jesus. And it is likely that he did in fact receive baptism. But if these (disciples) of John, after that baptism again received baptism, was this needful for the disciples also? And wherefore the need of water? These are very different from him, men who did not even know whether there were a Holy Ghost. “He was fervent,” then, “in the Spirit, knowing only the baptism of John:” but these “expounded to him more perfectly. And when he was disposed to pass into Achaia, the brethren wrote, exhorting the disciples to receive him; who, when he had come, helped them much which had believed through grace.” He wished then also to depart into Achaia, and these also encouraged (him to do so), having also given him letters. “Who when he had come, helped them much which had believed through grace: for he mightily convinced the Jews, and that publicly, showing by the Scriptures that Jesus was Christ.” “And it came to pass, that, while Apollos was at Corinth, Paul, having passed through the upper coasts”— meaning what we have read as to Cæsarea and the other places— came to Ephesus, and having found certain disciples, “he said to them, Have ye received the Holy Ghost since you believed? And they said unto him, We have not so much as heard whether there be any Holy Ghost. And he said unto them, Unto what then were ye baptized? And they said, Unto John's baptism. Then said Paul, John verily baptized with the baptism of repentance, saying unto the people, that they should believe in Him who should come after him, that is, on Christ Jesus.” For that they did not even believe in Christ is plain from his saying, “that they should believe in Him that was to come after him.” And he did not say, The baptism of John is nothing, but, It is incomplete. Nor does he add this (in so many words), but he taught them, and many received the Holy Ghost. “When they heard this, they were baptized in the name of the Lord Jesus. And when Paul had laid his hands upon them, the Holy Ghost came on them; and they spoke with tongues, and prophesied. And all the men were about twelve”: so that it was likely they had the Spirit, but it did not appear. “And all the men were about twelve.”
Source: Homilies on Acts (New Advent)