John Calvin on Acts 18:11

11. He continued there a year. We do not read that Paul stayed so long anywhere else save there; and yet it appeareth by his two epistles that he was not only likely to suffer much troubles, but that he had suffered many unjust and unmeet things by reason of the pride and unthankfulness of the people, so that we see that there was no part of warfare wherein the Lord did not wonderfully exercise him. Also, we gather what a hard and laborious matter the edifying of the Church is, seeing that the most excellent workmaster spent so much time about the laying of the foundation of one church only. Neither doth he boast that he had finished the work, but that the Lord had put others in his place, that they might build upon his foundation; as he saith afterwards that he had planted, and that Apollos had watered, (1 Corinthians 3:6.)

Acts 18:12-17

12. Now when Gallio was deputy of Achaia, the Jews rose with one accord against Paul, and brought him before the judgment-seat, 13. Saying, This man persuadeth men to worship God contrary to the law. 14. And when Paul was about to open his mouth, Gallio said unto them, If it were any injury or wicked fact, O Jews, I would according to reason maintain you: 15. But if it be a question of words and names, and your law, look ye to it yourselves; for I will be no judge in these matters. 16. And he drove them from the judgment-seat. 17. And when all the Greeks had caught Sosthenes, the ruler of the synagogue, they smote him before the judgment-seat. Neither did Gallio care for any of these things.