• "Eliseus was sought by the king of Syria; an army had been sent to capture him; and he was surrounded on all sides. His servant began to fear, for he was a servant, that is, he had not a free mind, nor had he free powers of action. The holy prophet sought to open his eyes, and said: "Look and see how many more are on our side than there are against us." (2 Kgs 6:16) And he beheld, and saw thousands of angels. Mark therefore that it is those that are not unseen rather than those that are seen that guard the servants of Christ. But if they guard you, they do it in answer to your prayers: for you have read that those very men, who sought Eliseus, entered Samaria, and came to him whom they desired to take. Not only were they unable to harm him, but they were themselves preserved at the intercession of the man against whom they had come.
"The Apostle Peter also gives you an example of either case. For when Herod sought him and took him, he was put into prison. For the servant of God had not got away, but stood firm without a thought of fear. The Church prayed for him, but the Apostle slept in prison, a proof that he was not in fear. An angel was sent to rouse him as he slept, by whom Peter was led forth out of prison, and escaped death for a time." (Sermo contra Auxent., 11-12.)
~St. Ambrose
The Liberation of St. Peter, by Raffaelo Sanzio.
Fresco, 1514; Stanza di Eliodoro, Palazzi Pontifici, Vatican.