The Enlightenment
How Enlightenment thinkers used reason and natural law to rethink government, how salons and print spread their ideas, and why their universal language excluded so many.
What you'll do in this lesson
A voice-first session with the Crimsora tutor on The Enlightenment, then targeted practice and FRQs — with the tutor adapting to where you get stuck.
What this lesson covers
In 1750 a Parisian could walk into a coffeehouse, pick up a newspaper, and read an argument that kings hold power only because the governed allow it. A century earlier that sentence could have gotten a printer imprisoned. The Enlightenment was the moment when the habits of the new science — observation, skepticism, the search for underlying laws — were turned on human institutions: monarchy, church, law courts, marriage, slavery, and trade.
This lesson asks three things of you. First, understand the reasoning: what did thinkers mean by natural law, and how did they get from it to conclusions about who should rule? Second, follow the ideas out of the study and into the world, through cheap print, coffeehouses, and salons. Third, hold the movement to its own standard. Enlightenment writers said "all men" and "mankind" constantly. Deciding who they actually meant — and who noticed the gap at the time — is the sharpest historical work in this unit.
This lesson asks three things of you. First, understand the reasoning: what did thinkers mean by natural law, and how did they get from it to conclusions about who should rule? Second, follow the ideas out of the study and into the world, through cheap print, coffeehouses, and salons. Third, hold the movement to its own standard. Enlightenment writers said "all men" and "mankind" constantly. Deciding who they actually meant — and who noticed the gap at the time — is the sharpest historical work in this unit.
Reason and Natural Law as Tools of Criticism
The Enlightenment (roughly 1680–1800) was not a school with a membership list. It was a shared method. Its writers, often called philosophes, assumed that human society, like the physical universe, runs on discoverable regularities, and that any institution unable to justify itself before reason deserves to be reformed or scrapped.
The central concept is natural law: a moral order that exists independently of any king's decree or any church's teaching, and that human beings can discover by thinking carefully about human nature. From natural law came natural rights — claims a person holds simply by being human, not as a gift from a ruler. If rights precede government, then government becomes an instrument that people create for a purpose, and it can be judged by whether it serves that purpose.
Notice the structure of the argument, because it recurs everywhere in the period. Step one: imagine humans before or outside government (the "state of nature"). Step two: identify what they need or already possess. Step three: derive what a legitimate government must therefore look like.
Students often flatten this into "Enlightenment thinkers believed in freedom." That is too vague to be useful and it hides real disagreement. Thomas Hobbes used exactly the same natural-law reasoning in Leviathan (1651) and concluded that people should surrender their rights to an absolute sovereign, because life without one is "solitary, poor, nasty, brutish, and short." Same method, opposite conclusion. What made the eighteenth century distinctive was not that everyone agreed, but that everyone now had to argue — tradition and divine right alone no longer settled the question.
The central concept is natural law: a moral order that exists independently of any king's decree or any church's teaching, and that human beings can discover by thinking carefully about human nature. From natural law came natural rights — claims a person holds simply by being human, not as a gift from a ruler. If rights precede government, then government becomes an instrument that people create for a purpose, and it can be judged by whether it serves that purpose.
Notice the structure of the argument, because it recurs everywhere in the period. Step one: imagine humans before or outside government (the "state of nature"). Step two: identify what they need or already possess. Step three: derive what a legitimate government must therefore look like.
Students often flatten this into "Enlightenment thinkers believed in freedom." That is too vague to be useful and it hides real disagreement. Thomas Hobbes used exactly the same natural-law reasoning in Leviathan (1651) and concluded that people should surrender their rights to an absolute sovereign, because life without one is "solitary, poor, nasty, brutish, and short." Same method, opposite conclusion. What made the eighteenth century distinctive was not that everyone agreed, but that everyone now had to argue — tradition and divine right alone no longer settled the question.
Competing Blueprints for Government
Four writers dominate most classroom treatments, and the differences among them matter more than the similarities.
Locke's move is the one with the longest afterlife. Because government exists to protect pre-existing rights, a ruler who systematically violates them dissolves the contract, and resistance is not treason but repair. Montesquieu supplied the machinery — the checks-and-balances architecture later written into constitutions — and drew part of it from an idealized reading of England's mixed government.
Rousseau is the hardest and the most misread. The general will is not a majority vote and not the sum of private preferences; it is what citizens will when each aims at the common good rather than at personal advantage. That distinction gives the concept real power and real danger: a leader who claims to know the general will better than citizens do can suppress dissent in the people's own name. Historians have argued about that tension since 1789, and you should be able to state both sides.
| Thinker | Key work | View of human nature | Prescription |
|---|---|---|---|
| Hobbes (1588–1679) | Leviathan, 1651 | Fearful, competitive | Absolute sovereign; the contract is among subjects, not with the ruler |
| Locke (1632–1704) | Two Treatises, 1689 | Reasonable, but lacking an impartial judge | Government by consent to protect life, liberty, property; people may resist a ruler who breaks the trust |
| Montesquieu (1689–1755) | The Spirit of the Laws, 1748 | Power-seeking whenever unchecked | Separate legislative, executive, and judicial power so each restrains the others; laws should suit a society's climate and customs |
| Rousseau (1712–1778) | The Social Contract, 1762 | Naturally decent, corrupted by inequality | Sovereignty belongs to the people as a body; law expresses the general will |
Rousseau is the hardest and the most misread. The general will is not a majority vote and not the sum of private preferences; it is what citizens will when each aims at the common good rather than at personal advantage. That distinction gives the concept real power and real danger: a leader who claims to know the general will better than citizens do can suppress dissent in the people's own name. Historians have argued about that tension since 1789, and you should be able to state both sides.
Reforming Law, Faith, and the Economy
Political theory was only part of the project. Voltaire (1694–1778) spent decades attacking judicial torture, censorship, and religious persecution, most famously in the Calas affair, where he campaigned to clear a Protestant merchant executed on flimsy evidence in Catholic Toulouse. His watchword, tolerance, was practical rather than sentimental: societies that persecute lose talent, trade, and peace. Many philosophes were deists, believing in a rational creator who set the universe running but does not intervene, rather than atheists — though a few, like Baron d'Holbach, went all the way to atheism.
Cesare Beccaria's On Crimes and Punishments (1764) argued that punishment should be certain, proportionate, and public rather than cruel and arbitrary, and that torture produces confessions rather than truth. It was translated across Europe within a few years, and rulers from Tuscany to Russia cited it while revising criminal codes.
Adam Smith's The Wealth of Nations (1776) applied the same analytic style to economics, arguing that self-interested exchange in competitive markets, not government hoarding of bullion, generates national wealth.
Some monarchs adopted pieces of this program without surrendering any power — Frederick II of Prussia, Catherine II of Russia, Joseph II of Austria. Historians call this enlightened absolutism. Joseph II abolished serfdom in his lands and extended toleration to Protestants and Jews; Catherine corresponded warmly with Voltaire while expanding serfdom in practice. Judging these rulers requires separating what they wrote from what they did, which is exactly the kind of evidence-weighing this course keeps asking of you.
Cesare Beccaria's On Crimes and Punishments (1764) argued that punishment should be certain, proportionate, and public rather than cruel and arbitrary, and that torture produces confessions rather than truth. It was translated across Europe within a few years, and rulers from Tuscany to Russia cited it while revising criminal codes.
Adam Smith's The Wealth of Nations (1776) applied the same analytic style to economics, arguing that self-interested exchange in competitive markets, not government hoarding of bullion, generates national wealth.
Some monarchs adopted pieces of this program without surrendering any power — Frederick II of Prussia, Catherine II of Russia, Joseph II of Austria. Historians call this enlightened absolutism. Joseph II abolished serfdom in his lands and extended toleration to Protestants and Jews; Catherine corresponded warmly with Voltaire while expanding serfdom in practice. Judging these rulers requires separating what they wrote from what they did, which is exactly the kind of evidence-weighing this course keeps asking of you.
The Machinery of Circulation: Print, Salons, Coffeehouses
Ideas do not spread because they are correct. They spread because something carries them. Rising literacy, cheaper paper, and a growing commercial book trade created a reading public across northwestern Europe, served by newspapers, pamphlets, periodicals, and lending libraries.
The emblematic project is the Encyclopédie (1751–1772), edited by Denis Diderot and Jean le Rond d'Alembert: twenty-eight volumes, more than 70,000 articles, roughly 140 contributors. It described trades and machines with unprecedented care, treating craft knowledge as worth recording, and it slipped criticism of church and state into cross-references and dry-sounding entries to evade censors. It was suppressed, then republished, and later editions in smaller, cheaper formats reached provincial lawyers and merchants far from Paris.
Just as important were the spaces where strangers argued face to face. Salons, gatherings hosted in private homes, were largely organized by women — Marie-Thérèse Geoffrin, Julie de Lespinasse, Suzanne Necker — who chose the guests, set the topics, and enforced the norms of civil disagreement. Coffeehouses in London, reading societies in German towns, and Masonic lodges did similar work with a broader social range. Scholars call the result a public sphere: a zone of discussion where the authority of an argument rested on its persuasiveness rather than on the speaker's rank.
Censorship shaped all of it. Books were published under false imprints, smuggled from Amsterdam and Geneva, or circulated in handwritten copies. Robert Darnton's research on the illegal book trade shows that scandalous pamphlets about court corruption often sold better than sober treatises, and probably did as much to corrode respect for the monarchy.
The emblematic project is the Encyclopédie (1751–1772), edited by Denis Diderot and Jean le Rond d'Alembert: twenty-eight volumes, more than 70,000 articles, roughly 140 contributors. It described trades and machines with unprecedented care, treating craft knowledge as worth recording, and it slipped criticism of church and state into cross-references and dry-sounding entries to evade censors. It was suppressed, then republished, and later editions in smaller, cheaper formats reached provincial lawyers and merchants far from Paris.
Just as important were the spaces where strangers argued face to face. Salons, gatherings hosted in private homes, were largely organized by women — Marie-Thérèse Geoffrin, Julie de Lespinasse, Suzanne Necker — who chose the guests, set the topics, and enforced the norms of civil disagreement. Coffeehouses in London, reading societies in German towns, and Masonic lodges did similar work with a broader social range. Scholars call the result a public sphere: a zone of discussion where the authority of an argument rested on its persuasiveness rather than on the speaker's rank.
Censorship shaped all of it. Books were published under false imprints, smuggled from Amsterdam and Geneva, or circulated in handwritten copies. Robert Darnton's research on the illegal book trade shows that scandalous pamphlets about court corruption often sold better than sober treatises, and probably did as much to corrode respect for the monarchy.
Universal Words, Bounded Membership
Enlightenment writers reached constantly for universal language — mankind, humanity, all men. The historical question is whether their practice matched that vocabulary, and the honest answer is usually no.
Most philosophes assumed women belonged in domestic life. Rousseau's Émile (1762) prescribed an education for girls organized entirely around pleasing men, even as he demanded liberty for citizens. Mary Wollstonecraft answered him directly in A Vindication of the Rights of Woman (1792), arguing that women appear frivolous because they are trained to be, and that reason has no sex; deny women education and you manufacture the inferiority you then cite as proof. Olympe de Gouges made the parallel move for political rights in 1791.
On slavery the record is mixed and often ugly. Montesquieu ridiculed pro-slavery arguments; the Abbé Raynal's widely read history condemned colonial cruelty; Condorcet called for abolition. Yet Locke invested in the Royal African Company and helped draft a colonial constitution granting masters absolute power over enslaved people, and Enlightenment natural history helped build racial hierarchy into science — Hume and Kant both wrote passages ranking peoples that later racial theorists quoted.
Avoid two easy errors. One is treating the Enlightenment as simply hypocritical, which ignores that its own vocabulary supplied the strongest weapons against those exclusions. The other is treating exclusions as mere blind spots of the age, which erases the people who objected at the time — Wollstonecraft, de Gouges, Ottobah Cugoano, Olaudah Equiano. A strong analysis holds both: universal principles were stated, deliberately bounded in practice, and then turned against their authors by the excluded.
Most philosophes assumed women belonged in domestic life. Rousseau's Émile (1762) prescribed an education for girls organized entirely around pleasing men, even as he demanded liberty for citizens. Mary Wollstonecraft answered him directly in A Vindication of the Rights of Woman (1792), arguing that women appear frivolous because they are trained to be, and that reason has no sex; deny women education and you manufacture the inferiority you then cite as proof. Olympe de Gouges made the parallel move for political rights in 1791.
On slavery the record is mixed and often ugly. Montesquieu ridiculed pro-slavery arguments; the Abbé Raynal's widely read history condemned colonial cruelty; Condorcet called for abolition. Yet Locke invested in the Royal African Company and helped draft a colonial constitution granting masters absolute power over enslaved people, and Enlightenment natural history helped build racial hierarchy into science — Hume and Kant both wrote passages ranking peoples that later racial theorists quoted.
Avoid two easy errors. One is treating the Enlightenment as simply hypocritical, which ignores that its own vocabulary supplied the strongest weapons against those exclusions. The other is treating exclusions as mere blind spots of the age, which erases the people who objected at the time — Wollstonecraft, de Gouges, Ottobah Cugoano, Olaudah Equiano. A strong analysis holds both: universal principles were stated, deliberately bounded in practice, and then turned against their authors by the excluded.
Key terms
- Natural law.
- A moral order held to exist in nature itself, knowable by human reason and binding regardless of what rulers or churches decree.
- Natural rights.
- Claims such as life, liberty, and property that a person holds by virtue of being human, not as a grant from government.
- Social contract.
- The idea that political authority originates in an agreement among people, which sets the purposes and therefore the limits of government.
- Philosophe.
- A French term for the eighteenth-century public intellectuals who applied reason and criticism to society; writers and popularizers rather than academic philosophers.
- Separation of powers.
- Montesquieu's principle that legislative, executive, and judicial functions should sit in different hands so that each can check the others.
- General will.
- Rousseau's term for what citizens will when they aim at the common good rather than private interest; the legitimate source of law, distinct from a simple majority of private preferences.
- Public sphere.
- The space of salons, coffeehouses, newspapers, and reading clubs where private people debated public matters and where argument carried more weight than rank.
- Enlightened absolutism.
- Rule by monarchs such as Frederick II, Catherine II, and Joseph II who adopted reforms in law, religion, or education while keeping absolute power intact.
Worked example
Read the two excerpts, then answer: How does Wollstonecraft use Enlightenment reasoning against Enlightenment writers?
Source A — John Locke, Second Treatise of Government (1689): "Men being, as has been said, by nature all free, equal, and independent, no one can be put out of this estate and subjected to the political power of another without his own consent."
Source B — Mary Wollstonecraft, A Vindication of the Rights of Woman (1792): "Contending for the rights of woman, my main argument is built on this simple principle, that if she be not prepared by education to become the companion of man, she will stop the progress of knowledge... for truth must be common to all."
Source A — John Locke, Second Treatise of Government (1689): "Men being, as has been said, by nature all free, equal, and independent, no one can be put out of this estate and subjected to the political power of another without his own consent."
Source B — Mary Wollstonecraft, A Vindication of the Rights of Woman (1792): "Contending for the rights of woman, my main argument is built on this simple principle, that if she be not prepared by education to become the companion of man, she will stop the progress of knowledge... for truth must be common to all."
Start by naming the shared premise rather than the disagreement. Both passages assume that reason is distributed across human beings and that conclusions about who may govern whom must be argued from that fact, not from custom. Wollstonecraft is not attacking Locke's method; she is adopting it.
Next, locate the move she makes. Locke's claim is about consent: authority over a free person requires that person's agreement. Wollstonecraft asks the obvious follow-up question that most of his readers skipped — if the premise is human freedom and reason, on what grounds is half the population excluded from education, property, and political voice? Her phrase "truth must be common to all" is doing the work. Truth that is not sex-specific implies reason that is not sex-specific.
Then identify her causal argument, because it is the part students most often miss. She does not merely assert that women are equal. She explains the appearance of inequality: deprived of serious education, women develop the frivolity that men then cite as evidence of natural inferiority. The supposed proof is a product of the policy it is used to justify — a circular argument she exposes.
Finally, state the historical significance in one sentence. This is the central pattern of the period's afterlife: universal language, once printed and circulating, could be picked up by the people it had been quietly written to exclude and used as a demand.
A complete answer would say: Wollstonecraft accepts the Enlightenment premise of universal reason and natural rights, then turns it against writers like Rousseau by showing that women's apparent unfitness for citizenship is manufactured by their exclusion from education, so the argument for excluding them is circular.
Next, locate the move she makes. Locke's claim is about consent: authority over a free person requires that person's agreement. Wollstonecraft asks the obvious follow-up question that most of his readers skipped — if the premise is human freedom and reason, on what grounds is half the population excluded from education, property, and political voice? Her phrase "truth must be common to all" is doing the work. Truth that is not sex-specific implies reason that is not sex-specific.
Then identify her causal argument, because it is the part students most often miss. She does not merely assert that women are equal. She explains the appearance of inequality: deprived of serious education, women develop the frivolity that men then cite as evidence of natural inferiority. The supposed proof is a product of the policy it is used to justify — a circular argument she exposes.
Finally, state the historical significance in one sentence. This is the central pattern of the period's afterlife: universal language, once printed and circulating, could be picked up by the people it had been quietly written to exclude and used as a demand.
A complete answer would say: Wollstonecraft accepts the Enlightenment premise of universal reason and natural rights, then turns it against writers like Rousseau by showing that women's apparent unfitness for citizenship is manufactured by their exclusion from education, so the argument for excluding them is circular.
Practice questions
Which statement best captures how Montesquieu's proposal differs from Locke's?
- Montesquieu rejected natural law, while Locke based his whole argument on it
- Montesquieu focused on the institutional structure that would restrain power, while Locke focused on the conditions under which authority is legitimate and may be resisted
- Montesquieu defended absolute monarchy, while Locke defended constitutional monarchy
- Montesquieu argued that sovereignty belongs to the people as a body expressing the general will, while Locke denied popular sovereignty
Answer: Montesquieu focused on the institutional structure that would restrain power, while Locke focused on the conditions under which authority is legitimate and may be resisted
Locke's Second Treatise answers the question of legitimacy: government exists by consent to protect natural rights, and a ruler who violates that trust may be resisted. The Spirit of the Laws answers a design question instead: assuming power corrupts whoever holds it, how should offices be arranged so that ambition checks ambition? Both accept natural law, so the first option is wrong. Montesquieu admired mixed and moderated government, not absolutism, so the third is wrong. The fourth describes Rousseau, not Montesquieu — a common mix-up because all three are grouped as advocates of limited government.
Explain why the Encyclopédie is considered as important to the Enlightenment as any single work of political theory.
Answer: Because it turned scattered criticism into a durable, portable, and widely distributed body of knowledge that reached readers far beyond Paris.
A strong answer covers three things. First, scale and content: twenty-eight volumes and tens of thousands of articles, edited by Diderot and d'Alembert, documenting crafts and machines alongside philosophy and thereby treating practical and elite knowledge as equally worth systematizing. Second, method of evasion: censorship meant that criticism of church and state was often tucked into cross-references and neutral-sounding entries, so the work shows how ideas moved under pressure rather than in open debate. Third, circulation: suppression, republication, and later cheaper editions carried it to provincial professionals, which is how a movement becomes a public rather than a coterie. Answers that only describe the Encyclopédie as a big book of facts miss the point that its significance lies in distribution and in the assumption that ordinary readers could judge received authority for themselves.
A historian writes: "The Enlightenment's exclusions were not oversights but choices." Give one piece of evidence that supports this claim and one that complicates it.
Answer: Support: Rousseau explicitly prescribed a subordinate education for girls in Émile in the same years he demanded liberty for citizens, and Locke invested in the Royal African Company while writing that men are by nature free. Complication: contemporaries such as Wollstonecraft, Olympe de Gouges, Condorcet, and Cugoano used Enlightenment premises to attack those exclusions, showing the tradition also generated its own critique.
The historian's claim depends on showing awareness, not just inconsistency — a choice requires that the alternative was visible. Rousseau's deliberate treatment of girls' education and Locke's financial and constitutional involvement with slavery demonstrate that these writers engaged with the questions and landed on exclusion. The complication is that the same principles, once in print, were immediately available to the excluded, so the movement cannot be reduced to a defense of privilege. The best historical writing holds both facts at once rather than picking the more comfortable one.
FAQ
- What is the difference between the Scientific Revolution and the Enlightenment?
- The Scientific Revolution changed how Europeans investigated nature, producing new methods and results in astronomy, physics, and anatomy. The Enlightenment applied that same confidence in observation and reason to human affairs — law, government, religion, economics, and education. The connection is direct: if Newton could find the laws governing planets, writers asked, why not find the principles that should govern societies?
- Were Enlightenment thinkers against religion?
- Most were not atheists. Many were deists who believed in a rational creator but rejected miracles, revelation, and clerical authority; others remained practicing Christians and argued for reform from within. What they broadly opposed was religious persecution, censorship by church courts, and the use of divine authority to shut down argument. A handful, such as d'Holbach, were genuine atheists, but they were a minority even among the philosophes.
- Did the Enlightenment cause the revolutions that followed?
- Ideas alone do not make revolutions; fiscal crises, food prices, war debts, and existing political conflicts do a great deal of the work. But the Enlightenment supplied the vocabulary in which grievances were expressed and demands were justified — consent, rights, representation, separation of powers — and the public sphere supplied the networks through which arguments traveled fast. Treat these ideas as a necessary resource that revolutionaries drew on, not as a single cause.
- Why do so many Enlightenment writers say "all men" if they did not mean everyone?
- Partly because the universal phrasing was the whole rhetorical point — an argument from human nature has to be stated universally to work against kings and priests. Partly because most of these writers assumed without argument that property-owning European men were the natural political actors, and simply did not extend the logic. The gap was visible at the time, and critics including Wollstonecraft, Olympe de Gouges, and formerly enslaved writers such as Cugoano and Equiano pressed exactly that inconsistency.
Learn this with a teacher, not a page
The Crimsora tutor teaches The Enlightenment live — explaining on a whiteboard, asking you questions, and adapting to where you get stuck.