18 So Paul still remained a good while. Then he took leave of the brethren and sailed for Syria, and Priscilla and Aquila were with him. He had his hair cut off at Cenchrea, for he had taken a vow. 19 And he came to Ephesus, and left them there; but he himself entered the synagogue and reasoned with the Jews. 20 When they asked him to stay a longer time with them, he did not consent, 21 but took leave of them, saying, "I must by all means keep this coming feast in Jerusalem; but I will return again to you, God willing." And he sailed 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.