Musar zu Schemuel II 8:18

And the third is that the holy people who are servants of God, may He be blessed, should not humble themselves to flesh and blood. So it is not fitting that the fear of flesh and blood be upon them except for the sake of the Heavens. As it is stated (Leviticus 25:55), “For it is to Me that the Israelites are servants” - [they are] My servants, and not the servants of servants. And it is stated (Exodus 19:6), “But you shall be to Me a kingdom of priests and a holy nation.” The expression, priests, is [to mean] masters and officers; and like this [usage] is (II Samuel 8:18) “and David’s sons were priests.” And the whole nation is called a kingdom, from [the usage] (I Kings 18:10), “there is no nation or kingdom”; (Isaiah 60:12), “For the nation or the kingdom.” The explanation [of Exodus 19:6] is that you shall be a kingdom that is all officers, such that the yoke of flesh and blood shall not be upon you. And it is stated (Isaiah 51:12), “What ails you that you fear man who must die”; and it is [also] stated (Isaiah 51:7), “Fear not the insults of men.” And our Rabbis, may their memory be blessed, said (Sotah 47b), “From the time when those who say to evil, good; and to good, evil,” proliferated, [they removed the yoke of the Heavens from upon themselves, and the yoke of flesh and blood was thrown upon them].” And King David, peace be upon him, said (Psalms 9:20-21). “Rise, O Lord; let not men have power; let the nations be judged in Your presence. Strike fear into them, O Lord; let the nations know they are only men. Selah.” We have learned from this that at a time when a man has power, he does not recognize that he is [only] a man. For dominion is not fitting for man, except for the sake of the Heavens.