14 But how shall we assemble together? Say you; how shall we observe the ordinances of the Lord? To be sure, just as the apostles also did, who were protected by faith, not by money; which faith, if it can remove a mountain, can much more remove a soldier. Be your safeguard wisdom, not a bribe. For you will not have at once complete security from the people also, should you buy off the interference of the soldiers. Therefore all you need for your protection is to have both faith and wisdom: if you do not make use of these, you may lose even the deliverance which you have purchased for yourself; while, if you do employ them, you can have no need of any ransoming.
Lastly, if you cannot assemble by day, you have the night, the light of Christ luminous against its darkness. You cannot run about among them one after another. Be content with a church of threes. It is better that you sometimes should not see your crowds, than subject yourselves (to a tribute bondage). Keep pure for Christ His betrothed virgin; let no one make gain of her. These things, my brother, seem to you perhaps harsh and not to be endured; but recall that God has said, “He who receives it, let him receive it,” that is, let him who does not receive it go his way.
He who fears to suffer, cannot belong to Him who suffered. But the man who does not fear to suffer, he will be perfect in love— in the love, it is meant, of God; “for perfect love casts out fear.” “And therefore many are called, but few chosen.” It is not asked who is ready to follow the broad way, but who the narrow. And therefore the Comforter is requisite, who guides into all truth, and animates to all endurance. And they who have received Him will neither stoop to flee from persecution nor to buy it off, for they have the Lord Himself, One who will stand by us to aid us in suffering, as well as to be our mouth when we are put to the question.
Source: De Fuga in Persecutione (New Advent)