The Social Classes are often rebuked and scoffed at by revolutionaries, despite it's unique and omnipresent proofs. These folk claim that all the self-evident evidences of differences between the Nobility and the Commons are nothing more than the effects of better nutrition, upbringing and medicine. In doing so they commit a great heresy against God but worse still, they promote the Great Lie: The Equality of Man.
These men, by claiming that the Noble and the Common are the same have led to enormous amounts of suffering. Because of them, blood runs in the streets and screams fill the air. They have spawned famine and plague through their arrogance and hatred. They claim to want to help the Commons, yet insist on crushing them under heel and worsening their conditions, stealing what little they have and denying them their ancient rights, as granted by the benevolence of the Nobles.
They refuse to acknowledge the truth plainly visible- were you to see a Noble and a Common standing next to each other, you would find that they were similar in many ways, yes, but they were also quite different. The Noble would be taller and would have have either hair or eyes of a unique color. While some colors, such as red or blonde, do occasionally occur in the Commons, usually as a result of some distant Noble ancestor, no Common has ever had hair that was white, except in old age. Nor have they had hair that was teal or purple or even bright green.
They do not have eyes of wine-violet, or blue, cherry-red or pink, or gold and silver. They do not grow as tall or as handsome, though I have met more than a few comely farmer's daughters. Yet to compare them to the Noblewomen is to put a racing hound up against a leopard. It is an unfair comparison, when not just nonsensical.
And even among those Nobles who are not beautiful, the ultimate truth of their divine right to rule is their command of the Mysteries. By speaking the right words, Nobles can control the elements. They bring light to the darkness, conjure fire and snow from thin air, make food from refuse and stone and heal grievous injuries. The only Commons who can wield the power of the arcane are those who have some Noble blood flowing within their veins, usually within 6 generations of their birth. Anymore and the blood is too diluted to lend any power.
And this is the case for all Nobles. Even the lowliest of the Nobles can command arcane power, even if it's only in some minor way. This separates them inexorably, no matter what the revolutionaries say. This is most emphasized in the name of the Kings, who are heralded by miracles and great wonders. At the coronation of Robert III, God's blessings on him and his name, a blind man was gifted his sight to see his Sovereign for the first time, while three pregnant women gave birth simultaneously to three healthy, identical children born with eyes the same color as the Sovereign, bright green.
Rumors of the Nobility electing one of their own to the throne and faking these miracles through sorcery is, of course, to be considered propaganda and lies.