18 Paul stayed in Corinth for some time after that, then said good-bye to the brothers and sisters and went to nearby Cenchrea. There he shaved his head according to Jewish custom, marking the end of a vow. Then he set sail for Syria, taking Priscilla and Aquila with him. 19 They stopped first at the port of Ephesus, where Paul left the others behind. While he was there, he went to the synagogue to reason with the Jews. 20 They asked him to stay longer, but he declined. 21 As he left, however, he said, "I will come back later, God willing." Then he set sail from Ephesus.
Matthew Henry's Commentary on Acts 18:18-21
Commentary on Acts 18:18-23
(Read Acts 18:18-23)
While Paul found he laboured not in vain, he continued labouring. Our times are in God's hand; we purpose, but he disposes; therefore we must make all promises with submission to the will of God; not only if providence permits, but if God does not otherwise direct our motions. A very good refreshment it is to a faithful minister, to have for awhile the society of his brethren. Disciples are compassed about with infirmity; ministers must do what they can to strengthen them, by directing them to Christ, who is their Strength. Let us earnestly seek, in our several places, to promote the cause of Christ, forming plans that appear to us most proper, but relying on the Lord to bring them to pass if he sees good.