5 What, then, shall we say to the position which you thus state in your former epistle:— “I do not see what good we can do to ourselves or to the people by continuing to remain in the churches, except to see before our eyes men slain, women outraged, churches burned, ourselves expiring amid torments applied in order to extort from us what we do not possess”? God is powerful to hear the prayers of His children and to avert those things which they fear; and we ought not, on account of evils that are uncertain, to make up our minds absolutely to the desertion of that ministry, without which the people must certainly suffer ruin, not in the affairs of this life, but of that other life which ought to be cared for with incomparably greater diligence and solicitude. For if those evils which are apprehended, as possibly visiting the places in which we are, were certain, all those for whose sake it was our duty to remain would take flight before us, and would thus exempt us from the neccessity of remaining; for no one says that ministers are under obligation to remain in any place where none remain to whom their ministry is necessary. In this way some holy bishops fled from Spain when their congregations had, before their flight, been annihilated, the members having either fled, or died by the sword, or perished in the siege of their towns, or gone into captivity: but many more of the bishops of that country remained in the midst of these abounding dangers, because those for whose sakes they remained were still remaining there. And if some have abandoned their flocks, this is what we say ought not to be done, for they were not taught to do so by divine authority, but were, through human infirmity, either deceived by an error or overcome by fear.
6. [We maintain, as one alternative, that they were deceived by an error,] for why do they think that indiscriminate compliance must be given to the precept in which they read of fleeing from one city to another, and not shrink with abhorrence from the character of the “hireling,” who “sees the wolf coming, and flees, because he cares not for the sheep”? Why do they not honour equally both of these true sayings of the Lord, the one in which flight is permitted or enjoined, the other in which it is rebuked and censured, by taking pains so to understand them as to find that they are, as is indeed the case, not opposed to each other? And how is their reconciliation to be found, unless that which I have above proved be borne in mind, that under pressure of persecution we who are ministers of Christ ought to flee from the places in which we are only in one or other of two cases, namely, either that there is no congregation to which we may minister, or that there is a congregation, but that the ministry necessary for it can be supplied by others who have not the same reason for flight as makes it imperative on us? Of which we have one example, as already mentioned, in the Apostle Paul escaping by being let down from the wall in a basket, when he was personally sought by the persecutor, there being others on the spot who had not the same necessity for flight, whose remaining would prevent the Church from being destitute of the service of ministers. Another example we have in the holy Athanasius, Bishop of Alexandria, who fled when the Emperor Constantius wished to seize him specially, the Catholic people who remained in Alexandria not being abandoned by the other servants of God. But when the people remain and the servants of God flee, and their service is withdrawn, what is this but the guilty flight of the “hireling” who cares not for the sheep? For the wolf will come—not man, but the devil, who has very often perverted to apostasy believers to whom the daily ministry of the Lord's body was wanting; and so, not “through your knowledge,” but through your ignorance, “shall the weak brother perish for whom Christ died.”
Source: Letters (New Advent)