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Bruce, F.F. (1988). "Ephesus (18:18-26 [section continues through 19:20])." In The Book of Acts (Revised). (354-361). William B. Eerdmans Publishing,
In Acts 18:18, Bruce notes Paul would have little motivation to leave Corinth in light of Gallio's decision to exonerate him (Bruce 1988, p. 354). However, probably in the spring of 52, he went with Priscilla and Aquila to Ephesus. Paul's vow may well have been one of thanksgiving as he had met no harm in Corinth. Bruce discusses the importance of Ephesus, both politically and economically (Bruce 1988, p. 355). Verses 20-21, in the Western text, show Paul as eager to hurry to Jerusalem for a festival. This was likely Passover, early in April in A.D. 52. Navigation was generally closed until March 10 due to weather, so there was little leeway (Bruce 1988, p. 356).
Acts 18:22-23 continues Paul's quick visit from Caesarea to Jerusalem ("up" to "the church"), then "down" to Antioch. Bruce considers this not to be the trip referenced in Galatians 2:1-10 (Bruce 1988, p. 356). After bringing some news to Antioch, Paul continued his journey. Bruce observes that Acts 18:22-23 and 19:1 add up to about 15000 miles of travel (Bruce 1988, p. 357). Along the way, Paul's goal was not so much "pioneer evangelism" but helping and encouraging previously established churches.
In Acts 18:24-28 we are introduced to Apollos. He was a Jew from Alexandria, possibly a traveling merchant (Bruce 1988, p. 358). Somewhere he had been instructed in "the way of the Lord." However, Paul notes he had not been instructed in baptism (Bruce 1988, p. 359). Bruce suggests that the description of Apollos' fervor may have indicated a particular gift of the Holy Spirit. In Acts 18:26, Priscilla and Aquila encouraged Apollos and corrected his teaching (Bruce 1988, p. 360). Apollos subsequently went to Corinth, where he had a strong influence on the church (Bruce 1988, p. 361).