John Chrysostom
After saying whence authorities arise, the Apostle added, “Therefore whoever resists the authority resists the ordinance of God.” See where he leads the matter, what he uses to inspire fear, and how he proves that obedience is our duty. Lest the faithful should say, “You are lowering us and making us contemptible by subjecting to rulers those who are to receive the heavenly kingdom,” the Apostle proves that even here he subjects them not to rulers, but again to God. For the one who submits to authorities obeys God. Yet the Apostle does not say this in such words as, “Whoever obeys rulers obeys God.” Instead, he inspires fear by the opposite and confirms the same thing with greater force, saying: whoever does not obey the ruler resists God, who has ordained this.
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Everywhere he strives to impress this upon us, namely, that we do not bestow obedience on authorities as a gift, but fulfill a duty. By such instructions the Apostle both urged the faithful to obedience and disposed unbelieving rulers favorably toward Christian piety. For at that time a rumor spread everywhere accusing the Apostles of rebellion and innovations. It also claimed that by word and deed they were trying to undermine all public laws. But by proving that our common Master commands all to observe these laws, one can stop the mouths of slanderers who accuse us of innovations, and defend the true teaching with greater boldness. Therefore, says the Apostle, do not be ashamed of such obedience. God gave this law, and He sternly avenges those who violate it. If you disobey Him, He will punish you, not with an incidental punishment, but with the strictest one. No excuses will save you. You will also suffer the harshest punishment from men, because no one will defend you, and you will greatly anger God. This is what the Apostle impresses upon us when he says, “Those who resist will receive sin upon themselves.”