Albert Barnes Commentary Romans 13:5

"Wherefore [ye] must needs be in subjection, not only because of the wrath, but also for conscience` sake." — Romans 13:5 (ASV)

Therefore, (dio). The reasons why we should be subject, which the apostle had given, were two:

1. That government was appointed by God.
2. That violation of the laws would necessarily expose to punishment.

You must needs be. It is necessary (anagkh) to be. This is a word stronger than that which implies mere fitness or propriety. It means that it is a matter of high obligation and necessity to be subject to the civil ruler.

Not only for wrath. Not only on account of the fear of punishment, or the fact that wrath will be executed on evildoers.

For conscience' sake. As a matter of conscience, or of duty to God, because he has appointed it and made it necessary and proper. A good citizen yields obedience because it is the will of God, and a Christian makes it a part of his religion to maintain and obey the just laws of the land. See Matthew 22:21. Compare Ecclesiastes 8:2: I counsel them to keep the king's commandments, and that in regard of the oath of God.