5 For do not tell me that this or that man is a runaway slave, or a robber or thief, or laden with countless faults, or that he is a mendicant and abject, or of low value and worthy of no account; but consider that for his sake the Christ died; and this suffices you for a ground for all solicitude. Consider what sort of person he must be, whom Christ valued at so high a price as not to have spared even his own blood. For neither, if a king had chosen to sacrifice himself on any one's behalf, should we have sought out another demonstration of his being some one great and of deep interest to the King— I fancy not— for his death would suffice to show the love of him who had died towards him. But as it is not man, not angel, not archangel; but the Lord of the heavens himself, the only-begotten Son of God himself having clothed himself with flesh, freely gave himself on our behalf. Shall we not do everything, and take every trouble, so that the men who have been thus valued may enjoy every solicitude at our hands? And what kind of defence shall we have? What allowance? This at least is the very thing by way of declaring which Paul also said, “Do not by your meat destroy him for whose sake Christ died.” For desiring to shame, and to bring to solicitude, and to persuade to care for their neighbours, those who despise their brethren, and look down upon them as being weak, instead of all else he set down the Master's death.
Sitting then in the prison he wrote the letter to the Philippians from that so great distance. For such as this is the love that is according to God: it is interrupted by no one of human things, since it has its roots from above in the heavens and its recompense. And what says he? “Now I desire that you should know, brethren.” Do you see solicitude for his scholars? Do you see a teacher's carefulness? Hear too of loving affection of scholars towards their teacher, that you may know that this was what made them strong and unconquerable— the being bound together with one another. For if “Brother helped by brother is as a strong city;” far more so many bound together by the bonds of love would have entirely repulsed the plotting of the wicked demon. That indeed then Paul was bound up with the disciples, requires not even any demonstration further nor argument for us, since in truth even when in bonds he anxiously cared for them, and each day, he was also dying for them, burning with his longing.
Source: Homily Concerning "Lowliness of Mind" (New Advent)