John Chrysostom
After spending considerable time in the city of Ephesus, Paul again wishes to go to another place. Therefore he sends Timothy and Erastus to Macedonia, while he himself remains in Ephesus. How is it, then, that after previously intending to depart for Syria, Acts 18:18, he returns again to Macedonia? This was to show that he did everything not by his own power. At the same time he foretells the future: "I must," he says, "see Rome also." Perhaps he said this wishing to console the disciples with the news that he would not remain in Jerusalem, but would come to them again. By such a prophecy he encouraged their souls.
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From this I conclude that in Ephesus he wrote the epistle to the Corinthians, in which he says, "We do not want you to be ignorant, brethren, of our affliction which came to us in Asia" (2 Cor 1:8). He had promised to come to Corinth, and therefore he excuses his delay and points to the trial, meaning the affair of Demetrius. But let us return to what was said above. "When these things were accomplished," says the writer, "Paul purposed in the Spirit, after passing through Macedonia and Achaia, to go to Jerusalem." He does this not according to human judgment, but "in the Spirit," by whose prompting he resolves to go. This is what the word "purposed" means. It has precisely this sense.