9 You say that no example is found in the writings of evangelists and apostles, of any petition presented on behalf of the Church to the kings of the earth against her enemies. Who denies this? None such is found. But at that time the prophecy, “Be wise now, therefore, O you kings; be instructed, you judges of the earth: serve the Lord with fear,” was not yet fulfilled. Up to that time the words which we find at the beginning of the same Psalm were receiving their fulfilment, “Why do the heathen rage, and the people imagine a vain thing? The kings of the earth set themselves, and the rulers take counsel together against the Lord, and against His Anointed.” Truly, if past events recorded in the prophetic books were figures of the future, there was given under King Nebuchadnezzar a figure both of the time which the Church had under the apostles, and of that which she has now. In the age of the apostles and martyrs, that was fulfilled which was prefigured when the aforesaid king compelled pious and just men to bow down to his image, and cast into the flames all who refused. Now, however, is fulfilled that which was prefigured soon after in the same king, when, being converted to the worship of the true God, he made a decree throughout his empire, that whosoever should speak against the God of Shadrach, Meshach, and Abednego, should suffer the penalty which their crime deserved. The earlier time of that king represented the former age of emperors who did not believe in Christ, at whose hands the Christians suffered because of the wicked; but the later time of that king represented the age of the successors to the imperial throne, now believing in Christ, at whose hands the wicked suffer because of the Christians.
10. It is manifest, however, that moderate severity, or rather clemency, is carefully observed towards those who, under the Christian name, have been led astray by perverse men, in the measures used to prevent them who are Christ's sheep from wandering, and to bring them back to the flock, when by punishments, such as exile and fines, they are admonished to consider what they suffer, and wherefore, and are taught to prefer the Scriptures which they read to human legends and calumnies. For which of us, yea, which of you, does not speak well of the laws issued by the emperors against heathen sacrifices? In these, assuredly, a penalty much more severe has been appointed, for the punishment of that impiety is death. But in repressing and restraining you, the thing aimed at has been rather that you should be admonished to depart from evil, than that you should be punished for a crime. For perhaps what the apostle said of the Jews may be said of you: “bear them record that they have a zeal of God, but not according to knowledge: for, being ignorant of the righteousness of God, and going about to establish their own righteousness, they have not submitted themselves to the righteousness of God.” For what else than your own righteousness are you desiring to establish, when you say that none are justified but those who may have had the opportunity of being baptized by you? In regard to this statement made by the apostle concerning the Jews, you differ from those to whom it originally applied in this, that you have the Christian sacraments, of which they are still destitute. But in regard to the words, “being ignorant of God's righteousness, and going about to establish their own righteousness,” and “they have a zeal of God, but not according to knowledge,” you are exactly like them, excepting only those among you who know what is the truth, and who in the wilfulness of their perversity continue to fight against truth which is perfectly well known to them. The impiety of these men is perhaps even a greater sin than idolatry. Since, however, they cannot be easily convicted of this (for it is a sin which lies concealed in the mind), you are all alike restrained with a comparatively gentle severity, as being not so far alienated from us. And this I may say, both concerning all heretics without distinction, who, while retaining the Christian sacraments, are dissenters from the truth and unity of Christ, and concerning all Donatists without exception.
11. But as for you, who are not only, in common with these last, styled Donatists, from Donatus, but also specially named Rogatists, from Rogatus, you indeed seem to be more gentle in disposition, because you do not rage up and down with bands of these savage Circumcelliones: but no wild beast is said to be gentle if, because of its not having teeth and claws, it wounds no one. You say that you have no wish to be cruel: I think that power, not will is wanting to you. For you are in number so few, that even if you desire it, you dare not move against the multitudes which are opposed to you. Let us suppose, however, that you do not wish to do that which you have not strength to do; let us suppose that the gospel rule, “If any man will sue you at the law and take away your coat, let him have your cloak also,” is so understood and obeyed by you that resistance to those who persecute you is unlawful, whether they have right or wrong on their side. Rogatus, the founder of your sect, either did not hold this view, or was guilty of inconsistency; for he fought with the keenest determination in a lawsuit about certain things which, according to your statement, belonged to you. If to him it had been said, Which of the apostles ever defended his property in a matter concerning faith by appeal to the civil courts? As you have put the question in your letter, “Which of the apostles ever invaded the property of other men in a matter concerning faith?” he could not find any example of this in the Divine writings; but he might perhaps have found some true defence if he had not separated himself from the true Church, and then audaciously claimed to hold in the name of the true Church the disputed possession.
Source: Letters (New Advent)