2 If, because injustice is not from God, but from the devil, and persecution consists of injustice (for what more unjust than that the bishops of the true God, that all the followers of the truth, should be dealt with after the manner of the vilest criminals?), persecution therefore seems to proceed from the devil, by whom the injustice which constitutes persecution is perpetrated, we ought to know, as you have neither persecution without the injustice of the devil, nor the trial of faith without persecution, that the injustice necessary for the trial of faith does not give a warrant for persecution, but supplies an agency; that in reality, in reference to the trial of faith, which is the reason of persecution, the will of God goes first, but that as the instrument of persecution, which is the way of trial, the injustice of the devil follows.
For in other respects, too, injustice in proportion to the enmity it displays against righteousness affords occasion for attestations of that to which it is opposed as an enemy, that so righteousness may be perfected in injustice, as strength is perfected in weakness. For the weak things of the world have been chosen by God to confound the strong, and the foolish things of the world to confound its wisdom. Thus even injustice is employed, that righteousness may be approved in putting unrighteousness to shame.
Therefore, since the service is not of free-will, but of subjection (for persecution is the appointment of the Lord for the trial of faith, but its ministry is the injustice of the devil, supplied that persecution may be got up), we believe that persecution comes to pass, no question, by the devil's agency, but not by the devil's origination. Satan will not be at liberty to do anything against the servants of the living God unless the Lord grant leave, either that He may overthrow Satan himself by the faith of the elect which proves victorious in the trial, or in the face of the world show that apostatizers to the devil's cause have been in reality His servants.
You have the case of Job, whom the devil, unless he had received authority from God, could not have visited with trial, not even, in fact, in his property, unless the Lord had said, “Behold, all that he has I put at your disposal; but do not stretch out your hand against himself.” In short, he would not even have stretched it out, unless afterwards, at his request, the Lord had granted him this permission also, saying, “Behold, I deliver him to you; only preserve his life.” So he asked in the case of the apostles likewise an opportunity to tempt them, having it only by special allowance, since the Lord in the Gospel says to Peter, “Behold, Satan asked that he might sift you as grain; but I have prayed for you that your faith fail not;” that is, that the devil should not have power granted him sufficient to endanger his faith.
Whence it is manifest that both things belong to God, the shaking of faith as well as the shielding of it, when both are sought from Him— the shaking by the devil, the shielding by the Son. And certainly, when the Son of God has faith's protection absolutely committed to Him, beseeching it of the Father, from whom He receives all power in heaven and on earth, how entirely out of the question is it that the devil should have the assailing of it in his own power! But in the prayer prescribed to us, when we say to our Father, “Lead us not into temptation” (now what greater temptation is there than persecution?), we acknowledge that that comes to pass by His will whom we beseech to exempt us from it.
For this is what follows, “But deliver us from the wicked one,” that is, do not lead us into temptation by giving us up to the wicked one, for then are we delivered from the power of the devil, when we are not handed over to him to be tempted. Nor would the devil's legion have had power over the herd of swine unless they had got it from God; so far are they from having power over the sheep of God. I may say that the bristles of the swine, too, were then counted by God, not to speak of the hairs of holy men.
The devil, it must be owned, seems indeed to have power— in this case really his own— over those who do not belong to God, the nations being once for all counted by God as a drop of the bucket, and as the dust of the threshing-floor, and as the spittle of the mouth, and so thrown open to the devil as, in a sense, a free possession. But against those who belong to the household of God he may not do ought as by any right of his own, because the cases marked out in Scripture show when— that is, for what reasons— he may touch them.
For either, with a view to their being approved, the power of trial is granted to him, challenged or challenging, as in the instances already referred to, or, to secure an opposite result, the sinner is handed over to him, as though he were an executioner to whom belonged the inflicting of punishment, as in the case of Saul. “And the Spirit of the Lord,” says Scripture, “departed from Saul, and an evil spirit from the Lord troubled and stifled him;” or the design is to humble, as the apostle tells us, that there was given him a stake, the messenger of Satan, to buffet him; and even this sort of thing is not permitted in the case of holy men, unless it be that at the same time strength of endurance may be perfected in weakness.
For the apostle likewise delivered Phygellus and Hermogenes over to Satan that by chastening they might be taught not to blaspheme. You see, then, that the devil receives more suitably power even from the servants of God; so far is he from having it by any right of his own.
Source: De Fuga in Persecutione (New Advent)