John Chrysostom
See, even after this appearance the Lord allows him again to be saved in a human way. It is worthy of wonder that Paul was not troubled and did not say, 'What does this mean? Have I been deceived by Christ?' No, he neither thought nor felt anything of the sort. He only believed. Yet while believing, he did not sleep. He did not fail to do what could be done with the help of human wisdom. What was said to Paul is also full of wisdom. 'The following night the Lord stood by him and said, Take courage, Paul. For as you have testified concerning Me in Jerusalem, so you must also testify in Rome.' See what consolation this is. First the Lord praises him. Then He inspires him not to fear the journey to Rome, which was not yet known.
Read more (92 words)
It is as though He says: you will not only go there, but will also show great boldness. This expression does not mean merely that he will be saved. It means that he will bear witness with great glory in the great city. Why did the Lord not appear to him before he fell into danger? Because God always comforts in sorrows, when He is more desired, and teaches us amid dangers. Or to say it another way: when Paul was free from bonds, he remained calm. But now afflictions awaited him.