Acts 16:9

9, 10. Here he learns the object which the Spirit had in view, while turning him aside from one after another of the fields which he himself had chosen. (9) "Then a vision appeared to Paul in the night. There stood a man of Macedonia, entreating him, and saying, Come over into Macedonia and help us. (10) And when he saw the vision, we immediately sought to go forth into Macedonia, inferring that the Lord had called us to preach the gospel them."

This overruling of Paul's purpose, coupled with the absence of it at other times, indicates something of the method by which the journeyings of inspired men were directed. While their own judgment led to a judicious choice, it was permitted to guide them; but when it failed, as was likely to be the case, through their ignorance of the comparative accessibility of different communities, or the circumstances of individuals, they were overruled by some controlling providence, like Paul in Galatia; directed by angels, like Philip in Samaria; or by the Spirit, like Peter in Joppa; restrained from some purpose, like Paul and Silas when attempting to enter Asia and Bythinia; or called away across the sea, as he was now, by a vision at night. We will yet see that, as in the cases of Philip and of Peter, the prayers of individuals ready to hear the gospel were connected with the divine interference by which Paul and Silas were now being directed.