7 And then therefore being in bonds he writes to the Philippians, saying, “Now I desire that you should know, brethren,” calling the disciples brethren. For such a thing as this is love; it casts out all inequality, and knows not superiority and dignity; but even if one be higher than all, he descends to the lowlier position of all; just what Paul also used to do. But let us hear what it is that he desires they should know. “That the things which happened unto me,” he says, “have fallen out rather to the furtherance of the gospel.” Tell me, how and in what way?
Have you then been released from your bonds? Have you then put off your chain? And do you with free permission preach in the city? Have you then, having gone into an assembly, drawn out many long discourses about the faith, and departed after gaining many disciples? Have you then raised the dead and been made an object of wonder? Have you then cleansed lepers, and all were astounded? Have you driven away demons, and been exalted? No one of these things, he says. How then did the furtherance of the gospel take place?
Tell me. “So that my bonds,” he says, “have become openly known in the whole Court, and to all the rest.” What do you say? This then, this was the furtherance, this the advance, this the increase of the proclamation— that all knew that you were bound. Yes, he says: Hear at least what comes next, that you may learn that the bonds not only proved no hindrance, but also a ground of greater freedom of speech. “So that several of the brethren in the Lord, in reliance on my bonds, more abundantly dare fearlessly to speak the word.” What do you say, O Paul?
Have your bonds inspired not anxiety but confidence? Not fear but earnest longing? The things mentioned have no consistency. I too know it. For neither did these things take place according to the consistency of human affairs, he means, but what came about was above nature, and the successes were of divine grace. On this account what used to cause anxiety to all others, that to him afforded confidence. For also if any one having taken the leader of an army and confined him, have made this publicly known, he throws the whole camp into flight; and if any one have carried a shepherd away from the flock, the security with which he drives off the sheep is great.
But not in Paul's case was it thus, but the contrary entirely. For the leader of the army was bound, and the soldiers became more forward in the spirit; and the confidence with which they sprung upon their adversaries was greater: the shepherd was in confinement, and the sheep were not consumed, nor even scattered.
Source: Homily Concerning "Lowliness of Mind" (New Advent)