John Wesley on Acts 21:33

Then the tribune - Having made his way through the multitude, came near and took him - And how many great ends of providence were answered by this imprisonment? This was not only a means of preserving his life, (after he had suffered severely for worldly prudence,) but gave him an opportunity of preaching the Gospel safely, in spite of all tumult, Acts 22:22, yea, and that in those places to which otherwise he could have had no access, Acts 21:40. And commanded him to be bound with two chains - Taking it for granted he was some notorious offender. And thus the prophecy of Agabus was fulfilled, though by the hands of a Roman.