4 What ever then is what is meant? I wish to narrate to you the whole history from a point a little earlier; for it is needful to know in what circumstances Paul was when he was writing these things by letter. In what circumstances therefore was he? In prison and chains and intolerable perils. Whence is this manifest? From the epistle itself. For earlier than this he says, “Now I wish you to know, brethren, that the circumstances in which I am have come rather to the furtherance of the Gospel; so that my bonds have become manifest in Christ in the whole Court, and to all the others; and a good many of the brethren, trusting to my bonds, the more exceedingly dare fearlessly to speak the word.” Now Nero had then cast him into prison.
For just as some robber having set foot in the house, while all are sleeping, when stealing every thing, if he see any one having lit a lamp, both extinguishes the light and slays him who holds the lamp, in order that he may be allowed in security to steal and rob the property of others; so truly also the Cæsar Nero then, just as any robber and burglar while all were sleeping a deep and unconscious slumber; robbing the property of all, breaking into marriage chambers, subverting houses, displaying every form of wickedness; when he saw Paul having lighted a lamp throughout the world; (the word of his teaching;) and reproving his wickedness, exerted himself both to extinguish what was preached, and to put the teachers out of the way; in order that he might be allowed with authority to do anything he pleased; and after binding that holy man, cast him into prison.
It was at that time then that the blessed Paul wrote these things. Who would not have been astounded? Who would not have marvelled? Or rather who could adequately have been astounded at and admired that noble and heaven-reaching soul; in that, while bound in Rome and imprisoned, at so great a distance as that, he wrote a letter to the Philippians? For you know how great is the distance between Macedonia and Rome. But neither did the length of the way, nor the amount of time (required), nor the press of business, nor the peril and the dangers coming one upon another, nor anything else, drive out his love for and remembrance of the disciples; but he retained them all in his mind; and not so strongly were his hands bound with the chains as his soul was bound together and rivetted by his longing for the disciples: which very thing itself indeed also declaring, in the preface of the Epistle he said, “On account of my having you in my heart, both in my bonds, and in the defence and confirmation of the Gospel.” And just as a King, having ascended upon his throne at morning-tide and taken his seat in the royal courts, immediately receives from all quarters innumerable letters; so truly he also, just as in royal courts, seated in the dungeon, both received and sent his letters in far greater number; the nations from all quarters referring to his wisdom everything about what had taken place among themselves; and he administered more business than the reigning monarch in proportion to his having had a larger dominion entrusted to him. For in truth God had brought and put into his hands not those who inhabited the country of the Romans only, but also all the barbarians, both land and sea. And by way of showing this he said to the Romans, “Now I would not that you should be ignorant, brethren, that ofttimes I have purposed to come to you, and have been hindered until the present; in order that I might have some fruit also among you, as among the rest of the Gentiles too. Both to Greeks and barbarians, both to wise and those without understanding I am a debtor.” Every day therefore he was in anxious thought at one moment for Corinthians, at another for Macedonians; how Philippians, how Cappadocians, how Galatians, how Athenians, how they who inhabited Pontus, how all together were. But all the same, having had the whole world put into his hands, he continually cared not for entire nations only, but also for each single man; and now indeed he dispatched a letter on behalf of Onesimus, and now on behalf of him who among the Corinthians had committed fornication. For neither used he to regard this— that it was the individual who had sinned and needed advocacy; but that it was a human being; a human being, the living thing most precious to God; and for whose sake the Father had not spared even the Only-begotten.
Source: Homily Concerning "Lowliness of Mind" (New Advent)