Evolution of Civil Society Post-Aristotle: From Stoics to Medieval Thinkers

When Aristotle described the polis as a koinonia politike, he treated political community and civil society as the same thing. The state was simply society in its civic form, and being a good citizen meant taking part in public life. That neat equation did not survive the centuries that followed. As empires replaced city-states and a new religion reshaped how people thought about belonging, the idea of civil society slowly broke free from the idea of the state. This is the story of that long journey, from the Stoics who declared themselves citizens of the world to the medieval thinkers who carefully separated the authority of kings from the authority of the Church.

Where Aristotle left the idea of civil society 🔗

For Aristotle, there was no meaningful gap between society and the state. A person reached their full potential only as a member of the political community, and life outside it was either subhuman or divine. Civility was nothing more than the practice of good citizenship, and the well-ordered city was both the social and the political body at once. This classical view, where civil society and the political order are treated as identical, would dominate thinking for many centuries. The interesting question is what happened to it once the small, self-governing city was swallowed by something much larger.

The Stoics and the birth of world citizenship 🔗

The collapse of the independent Greek city under the empires of Alexander and then Rome created a problem. If a person’s identity came from belonging to one small city, what happened when that city was just one unit inside a vast, multi-ethnic empire? The Stoics offered a bold answer.

From the polis to the cosmopolis 🔗

The famous starting point is the Cynic philosopher Diogenes, who reportedly answered a question about his origins by calling himself a kosmopolites, a citizen of the world. The Stoics who came after him developed this into a full philosophy. According to the Stanford Encyclopedia of Philosophy, a committed philosophical cosmopolitanism only fully arrives with the Stoics of the third century, who argued that every rational human being belongs to a single moral community governed by reason. The boundaries of the local city no longer marked the limits of a person’s obligations. Each individual was a member of two communities at once: the local political community of birth, and the much wider community of all humanity.

This was a turning point. By splitting the local city from the universal community, the Stoics introduced the possibility that a person could belong to society in a way that did not depend on the state. The seed of a distinction between social and political belonging had been planted.

Cicero and the Roman idea of societas civilis 🔗

Rome turned these Greek ideas into something more practical. The statesman and philosopher Cicero absorbed Stoic thought and reworked it for a Roman audience. It is in his writing that we first meet the Latin phrase societas civilis, the direct ancestor of the term civil society. For Cicero, this referred to a politically organised community resting on shared law, mutual obligation, and the common good.

Cicero also pushed the Stoic insight in a new direction. Through his modification of Stoicism, he helped build the conceptual framework of a law of nations, or ius gentium, a body of natural justice binding all peoples regardless of which city they came from. His essay On Duties argued that human beings are born for one another and ought to strengthen the bonds of human society through mutual help and kindness. In Cicero, the universal moral community of the Stoics gains a more concrete legal and ethical shape. The idea that there are duties owed to humanity as a whole, beyond the laws of any single state, would echo through European thought for well over a thousand years.

St. Augustine and the two cities 🔗

The next great shift came with Christianity, and its most influential expression is the work of St. Augustine of Hippo. When the Visigoths sacked Rome in 410, many blamed the disaster on the abandonment of the old Roman gods in favour of Christianity. Augustine answered this charge in a monumental work written between roughly 413 and 426, known as The City of God, or De Civitate Dei.

Civitas Dei and civitas terrena 🔗

At the centre of the book lies a single powerful idea: human history is the story of two cities. According to Britannica, Augustine set out a vision of two societies, the community of the saved and the community of the damned. He named them the Civitas Dei, the City of God, and the Civitas Terrena, the earthly city. Augustine summed up the distinction memorably by saying that two kinds of love built two cities. Love of self, carried to the point of contempt for God, builds the earthly city. Love of God, carried to the point of contempt for self, builds the heavenly one.

It is essential to understand what Augustine meant by a “city”. He was not describing two physical states or two governments. The two cities are not places but communities of people defined by what they love. Crucially, the Latin word civitas for Augustine means a society rather than a state, and he often used it as a near equivalent of the word for society. The City of God is found wherever people live according to God’s will, even before the Church existed as a visible institution.

Why the two cities mattered for civil society 🔗

Augustine’s framework created a permanent space between spiritual fellowship and worldly power. A Christian could be a loyal member of a spiritual community that crossed all political borders while still living under, and obeying, an earthly government. This is the Stoic idea of dual membership transformed into a Christian idea of dual citizenship. The fellowship of believers was a society that the state did not create and could not contain. As an overview of Western political thought notes, Augustine’s distinction was fundamentally between two societies rather than simply between church and state, and his work dominated Christian political thinking for centuries. Later thinkers, including Aquinas and Dante, would draw heavily on it.

Medieval thinkers refine the balance 🔗

For several centuries after Augustine, Europe was too unsettled for much original political theorising. When systematic thought revived, the central question had become the relationship between two competing authorities: the spiritual power of the Church and the temporal power of kings and emperors. Medieval thinkers spent enormous energy trying to define the proper boundary between them.

Thomas Aquinas: nature and grace 🔗

The towering figure here is Thomas Aquinas, who combined Aristotle’s rediscovered political philosophy with Christian theology. His key move was to distinguish clearly between the natural order, which human reason can understand on its own, and the supernatural order, which is known through revelation. His guiding principle was that grace does not destroy nature but perfects it. As a study from the University of Notre Dame’s Church Life Journal explains, Aquinas separated what our natural capacities can discover through reason from what we receive through grace.

This had a major political consequence. Because the political community belongs to the natural order, it has a genuine value and a real autonomy of its own. The state is not merely a sinful necessity to be tolerated; it is a natural good aimed at the common welfare. Aquinas therefore softened the earlier suspicion of worldly power and gave the secular authority a legitimate, independent sphere, even while maintaining that the spiritual end of salvation stands higher.

Dante and the call for two independent powers 🔗

The poet Dante Alighieri, best known for the Divine Comedy, pushed the separation further in his treatise De Monarchia, written around 1312. Dante argued that the Church should hold no earthly political authority at all, and should instead guard the souls of men, while a universal temporal monarch should rule over political affairs and keep the peace. Both powers came from God, but they were granted for entirely different spheres. Strikingly, Dante imagined the whole human race as a single community pursuing earthly happiness as its proper goal. One scholarly reading of Dante’s Monarchia describes this vision of the human race as one civilitas, a phrase that can fairly be translated as civil society itself. Here the universal community of the Stoics returns in a new, secular form, conceived as humanity organised for temporal ends rather than purely spiritual ones.

Marsilius of Padua and a sharper line 🔗

The boldest medieval voice belonged to Marsilius of Padua, whose work Defensor Pacis appeared in 1324. According to the account of the text, Marsilius extended Dante’s separation of secular and religious authority, affirmed the sovereignty of the people and of civil law, and sought to strip the papacy of political power, leaving it only an honorary role. He insisted that the state should not be ruled by the clergy and that spiritual authority had no business interfering in political life. With Marsilius, the medieval debate edges remarkably close to the modern principle of keeping religious and civil authority in separate hands.

What this evolution gave to modern civil society 🔗

Looking across this long arc, three lasting contributions stand out. The Stoics and Cicero introduced the idea of a community of humanity wider than any single state, along with a law and a set of duties binding all people. Augustine added the powerful notion that human beings belong simultaneously to a spiritual fellowship and an earthly order, a dual membership that the state neither created nor controlled. The medieval thinkers then converted this religious insight into a practical political principle, carefully marking out an independent sphere for worldly authority and limiting the reach of the Church.

Taken together, these moves dismantled the tidy Aristotelian equation of society with the state. They opened up the idea that there could be forms of human association, spiritual, moral and universal, that stand apart from political authority. That space is exactly where the modern concept of civil society, as a realm distinct from the state, would eventually grow. The thinkers of the seventeenth and eighteenth centuries did not invent this distinction from nothing. They built on a foundation that the Stoics, the Romans, Augustine and the medieval theorists had patiently laid, brick by brick, over more than a thousand years.

What do you think? If the Stoics could already imagine themselves as citizens of the world two thousand years ago, why has a genuine sense of global belonging been so hard to achieve in practice? And do you find that the medieval effort to separate spiritual from political authority strengthened both, or weakened each in its own way?

References

1. https://plato.stanford.edu/entries/cosmopolitanism/
2. https://docslib.org/doc/13931709/cicero-and-citizenship
3. https://www.britannica.com/topic/The-City-of-God
4. https://ebooks.inflibnet.ac.in/psp07/chapter/st-augustine-and-thomas-aquinas/
5. https://churchlifejournal.nd.edu/articles/st-thomas-aquinas-and-the-fittingness-of-the-democratic-order/
6. https://press.ici-berlin.org/doi/10.37050/ci-16/lefort_dantes-modernity.html
7. https://en.wikipedia.org/wiki/Defensor_pacis