9 The teaching of the apostles was surely in everything according to the mind of God: they forgot and omitted nothing of the Gospel. Where, then, do you show that they renewed the command to flee from city to city? In fact, it was utterly impossible that they should have laid down anything so utterly opposed to their own examples as a command to flee, while it was just from bonds, or the islands in which, for confessing, not fleeing from the Christian name, they were confined, they wrote their letters to the Churches.
Paul bids us support the weak, but most certainly it is not when they flee. For how can the absent be supported by you? By bearing with them? Well, he says that people must be supported, if anywhere they have committed a fault through the weakness of their faith, just as (he enjoins) that we should comfort the faint-hearted; he does not say, however, that they should be sent into exile. But when he urges us not to give place to evil, he does not offer the suggestion that we should take to our heels, he only teaches that passion should be kept under restraint; and if he says that the time must be redeemed, because the days are evil, he wishes us to gain a lengthening of life, not by flight, but by wisdom.
Besides, he who bids us shine as sons of light, does not bid us hide away out of sight as sons of darkness. He commands us to stand steadfast, certainly not to act an opposite part by fleeing; and to be girt, not to play the fugitive or oppose the Gospel. He points out weapons, too, which persons who intend to run away would not require. And among these he notes the shield too, that you may be able to quench the darts of the devil, when doubtless you resist him, and sustain his assaults in their utmost force.
Accordingly John also teaches that we must lay down our lives for the brethren; much more, then, we must do it for the Lord. This cannot be fulfilled by those who flee. Finally, mindful of his own Revelation, in which he had heard the doom of the fearful, (and so) speaking from personal knowledge, he warns us that fear must be put away. “There is no fear,” says he, “in love; but perfect love casts out fear; because fear has torment”— the fire of the lake, no doubt. “He that fears is not perfect in love” — to wit, the love of God.
And yet who will flee from persecution, but he who fears? Who will fear, but he who has not loved? Yes; and if you ask counsel of the Spirit, what does He approve more than that utterance of the Spirit? For, indeed, it incites all almost to go and offer themselves in martyrdom, not to flee from it; so that we also make mention of it. If you are exposed to public infamy, says he, it is for your good; for he who is not exposed to dishonour among men is sure to be so before the Lord.
Do not be ashamed; righteousness brings you forth into the public gaze. Why should you be ashamed of gaining glory? The opportunity is given you when you are before the eyes of men. So also elsewhere: seek not to die on bridal beds, nor in miscarriages, nor in soft fevers, but to die the martyr's death, that He may be glorified who has suffered for you.
Source: De Fuga in Persecutione (New Advent)