Romans 13:4

"For he is the minister of God to thee for good." So far is he from terrifying thee, he says, that he even praises thee: so far from being a hindrance to thee, that he even works with thee. When then thou hast his praise and his succor, how is it that thou art not in subjection to him? For he maketh virtue easier for thee in other ways also, by chastising the wicked, by benefiting and honoring the good, and by working together with the will of God. Whence too he has even given him the name of "Minister." And consider: I give you counsel to be sober-minded, and he, by the laws, speaks the same language. I exhort you not to be rapacious and grasping. And he sits in judgment in such cases, and so is a worker together with us, and an assistant to us, and has been commissioned by God for this end. Hence there are both reasons for reverencing him, both because he was commissioned by God, and because it was for such an object. "But if thou do that which is evil, be afraid." It is not then the ruler that maketh the fear, but our own wickedness. "For he beareth not the sword in vain." You see how he hath furnished him with arms, and set him on guard like a soldier, for a terror to those that commit sin. "For he is the minister of God to execute wrath, a revenger upon him that doeth evil." Now lest you should start off at hearing again of punishment, and vengeance, and a sword, he says again that it is God's law he is carrying out. For what if he does not know it himself? yet it is God that hath so shaped things. If then, whether in punishing, or in honoring, he be a Minister, in avenging virtue's cause, in driving vice away, as God willeth, why be captious against him, when he is the cause of so many good doings, and paves the way for thine too? since there are many who first practised virtue through the fear of God. […]

But do you wish, he says, not to fear the power? Do what is good, and you will have praise from it; for it is God's minister to you for good. But if you do what is evil, be afraid: for not without cause does it bear the sword; for it is God's minister, an avenger in wrath upon him who does what is evil. Paul moves me in these words, in that he calls the worldly power and the judge of this world God's minister; and this he repeats not once, but a second and a third time.

He, it says, assists the will of God. For example: God counsels you to be chaste, and the ruler prescribes the same through laws. God exhorts you not to be covetous and a thief, and the ruler is appointed as judge over the same. Consequently, …

It is necessary to have a just intention, so that the man who is the minister of the law slays a man by law, not from the desire for vengeance, but from the love of justice. Whence the Apostle to the Romans, speaking to rulers, …

Fourth, he assigns the reason, saying: for he is God's minister to you for good. This is clear in regard to the proper order of rulers. For they are under the authority of God, the supreme ruler, as his ministers: because as ministers of his …

By him kings reign, Prov. viii. The usurpation of power and the abuse of power are not of God, for he is not the author of sin; but the power itself is. As our natural powers, though often abused and made instruments of sin, are from God's creating power, so civil powers are from God's governing power.

Hence it appears that laws with penalties for the lawless and disobedient ( 1 Tim. i. 9 ) must be constituted in Christian nations, and are agreeable with, and not contradictory to, the gospel. When men are become such beasts, such ravenous beasts, one to another, they must be dealt with accordingly, taken and destroyed in terrorem--to deter others.

First, As a holy God, that hates sin, against which, as it appears and puts up its head, a public testimony is thus borne. Secondly, As King of nations, and the God of peace and order, which are hereby preserved. Thirdly, As the protector of the good, whose persons, families, estates, and names, are by this means hedged about.

For he is the minister of God to thee for good,....

For he is the minister of God to thee for good - Here the apostle puts the character of the ruler in the strongest possible light. He is the minister of God - the office is by Divine appointment: the man who is worthy of the office will act in conformity to the will of God: and as the eyes of the Lord are over the righteous, and his ears open to their cry, consequently the ruler will be the minister of God to them for good.

The minister of God - The “servant” of God he is appointed by God to do his will, and to execute his purposes. “To thee.” For your benefit. For good - That is, to protect you in your rights; to vindicate your name, person, or property; and to guard your liberty, and secure to you the results of your industry. The magistrate is not appointed directly to “reward” people, but they “practically” furnish a reward by protecting and defending them, and securing to them the interests of justice. If thou do that ... - That is, if any citizen should do evil. Be afraid - Fear the just vengeance of the laws. For he beareth not the sword in vain - The “sword” is an instrument of punishment, as well as an emblem of war. Princes were accustomed to wear a sword as an emblem of their authority; and the “sword” was often used for the purpose of “beheading,” or otherwise punishing the guilty. The meaning of the apostle is, that he does not wear this badge of authority as an unmeaningful show, but that it will be used to execute the laws. As this is the design of the power intrusted to him, and as he will “exercise” his authority, people should be influenced “by fear” to keep the law, even if there were no better motive. A revenger ... - In Rom 12:19, vengeance is said to belong to God. Yet he “executes” his vengeance by means of subordinate agents. It belongs to him to take vengeance by direct judgments, by the plague, famine, sickness, or earthquakes; by the appointment of magistrates; or by letting loose the passions of people to prey upon each other. When a magistrate inflicts punishment on the guilty, it is to be regarded as the act of God taking vengeance “by him;” and on this principle only is it right for a judge to condemn a man to death. […]