18 Paul stayed a while longer in Corinth, but then it was time to take leave of his friends. Saying his good-byes, he sailed for Syria, Priscilla and Aquila with him. Before boarding the ship in the harbor town of Cenchrea, he had his head shaved as part of a vow he had taken. 19 They landed in Ephesus, where Priscilla and Aquila got off and stayed. Paul left the ship briefly to go to the meeting place and preach to the Jews. 20 They wanted him to stay longer, but he said he couldn't. 21 But after saying good-bye, he promised, "I'll be back, God willing."
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.