The Enlightenment

Topic 3.1 established that systematic thinking about society is old and plural. The nineteenth century did not invent the thinking. What it invented was a discipline — and disciplines get founded when something has gone wrong badly enough to require explaining.

Topic 3.2 takes the seven upheavals that made sociology necessary. This lesson takes the one that made all the others thinkable, and it begins with a catastrophe.

Lisbon, the morning of 1 November 1755. All Saints' Day.

The churches are full. At around half past nine, an earthquake — later estimated at magnitude eight or above — strikes off the coast. It lasts several minutes. Churches collapse on their congregations. Candles lit for the feast day start fires that burn for days. Forty minutes after the shaking, a tsunami arrives in the harbour, where survivors have gathered on open ground.

Somewhere between ten thousand and sixty thousand people die. One of Europe's great capitals, in one of its most devout kingdoms, is destroyed at the hour of worship, on a holy day.

And Europe cannot stop arguing about it.

The theological explanation — divine punishment — is offered immediately and does not survive contact with the details. Why the churches and not the brothels? Why the devout at prayer? Why Lisbon and not London? Voltaire wrote a poem within weeks attacking the philosophical optimism that held this to be the best of all possible worlds, and later made the earthquake a set-piece in Candide. Rousseau replied with an argument that is, in our terms, sociological: nature did not build twenty thousand houses of six and seven storeys, and had the inhabitants been dispersed the damage would have been far less. The catastrophe, he said, was substantially a product of how people had chosen to live.

Meanwhile in Königsberg a young Immanuel Kant wrote three essays attempting to explain the earthquake by natural causes — subterranean cavities and gases, as it happened, and wrong. The wrongness is not the point. The point is what he was doing: treating a catastrophe as a natural event with natural causes, to be investigated.

The idea, in plain words

Kant's short 1784 essay "An Answer to the Question: What is Enlightenment?" gives the slogan: enlightenment is humanity's emergence from a self-incurred immaturity — the inability to use one's own understanding without another's guidance. His motto: Sapere aude — dare to know.

Four things it produced that sociology uses

1. The idea of society as an object of science

The founding premise. If human arrangements have causes, they can be investigated — and the investigation need not defer to what the arrangements say about themselves (1.5.2). Montesquieu (3.1.5) and the Scots (3.1.6) are Enlightenment enterprises. So is Comte's programme (3.3.1), which simply names what they were doing.

2. Knowledge as a collective, public, cumulative enterprise

The Encyclopédie (1751–72), edited by Diderot and d'Alembert, ran to twenty-eight volumes and involved over a hundred contributors. Its ambition was to gather and organise all human knowledge — including, strikingly, detailed illustrated accounts of crafts and trades, which had never been treated as knowledge worth recording.

Two sociological points. Knowledge was reconceived as a collective product rather than the possession of authorities. And the Republic of Letters — the correspondence networks, journals, academies, coffee houses and salons through which ideas circulated across borders — is a genuine social infrastructure, and one that Habermas would later analyse as the emergence of a public sphere (5.6).

3. Institutional reform as an applied science

Cesare Beccaria's On Crimes and Punishments (1764) is the model. Beccaria argued that punishment should be justified only by its deterrent effect, that its certainty matters more than its severity, that it should be proportionate and publicly codified, that torture is both cruel and useless as a means of obtaining truth, and that the death penalty should be abolished. The book was translated across Europe within a few years and influenced legal codes on both sides of the Atlantic.

Note what it is: a causal theory of behaviour applied to institutional design. It is the founding text of what Part 10 calls classical criminology, and its assumptions — rational actors responding to costs — are the ancestors of rational choice (5.5). Its limits are the ones 1.4.2 identified, and they are still argued about.

4. Counting people

The least glamorous and, for Part 7, the most consequential.

John Graunt's Natural and Political Observations upon the Bills of Mortality (1662) took London's weekly death records — compiled to track plague — and did something nobody had done: he analysed them systematically, constructed something like a life table, estimated the population, noticed the stable excess of male births, and demonstrated regularities in mortality that no individual death could reveal.

William Petty named the enterprise political arithmetic: reasoning about the state's affairs in "number, weight and measure."

This is the origin of social statistics, and it carries the finding that Durkheim would build a discipline on: aggregate regularities exist that are invisible at the level of individuals (1.3.2, 4.2). By the nineteenth century this had become a movement — statistical societies, censuses, and Adolphe Quetelet's "average man" and his demonstration that rates of crime, marriage and suicide were remarkably stable year on year, which directly provoked Durkheim's question about what such stability could possibly mean.

The hardest and most important case, and it belongs here rather than in a footnote.

The Enlightenment proclaimed universal rights. France's Declaration of the Rights of Man and of the Citizen (1789) declared men born free and equal in rights. France at that moment held Saint-Domingue, the most profitable colony in the world, producing sugar and coffee with the labour of around half a million enslaved people under conditions so lethal that the population had to be continuously replenished by the slave trade.

In 1791 the enslaved population rose. Over thirteen years, against French, Spanish and British forces, they defeated every army sent against them, and in 1804 declared the independent state of Haiti — the first, and for a long time the only, state created by a successful revolt of the enslaved.

Michel-Rolph Trouillot's Silencing the Past (1995) makes the argument that matters for us. The Haitian Revolution, he shows, was not merely opposed at the time; it was unthinkable within the categories available to contemporary European observers. Reports were disbelieved, reinterpreted, attributed to outside agitation, or minimised — not because the evidence was weak but because the framework had no place for the enslaved as political agents making universal claims. And afterwards it was largely written out of the histories of the Age of Revolution, where it remains marginal in many general accounts to this day.

Three things follow, and each is load-bearing for this course.

The universalism was real and was applied selectively. Enlightenment thinkers wrote of universal rights while the economies of their societies rested on slavery; several of them — Hume and Kant among others — wrote passages of explicit racial hierarchy, a body of material that scholarship has documented in detail and that cannot be waved away as incidental.

And the universalism was nonetheless usable. The revolutionaries of Saint-Domingue took the declared principles seriously and applied them where their authors had not. That is not irony; it is how universal claims work once released — they can be picked up by anyone (2.1.8).

And the silencing is itself a sociological finding. Trouillot's analysis is a study of how the categories available to observers determine what can be perceived, recorded and transmitted — 2.4.1's typifications and 2.1.12's unmarked standard, operating on the historical record. It is also the single clearest illustration of why Part 6 exists.

Go deeper

The critique from inside sociology

Sociology has been one of the Enlightenment's sharpest critics as well as its product, and you need both positions.

Adorno and Horkheimer, Dialectic of Enlightenment (1944), written in exile during the Second World War, argue that enlightenment carries a self-destructive logic. Reason directed at the domination of nature becomes instrumental reason — concerned only with efficient means, indifferent to ends — and the same rationality that dissolves myth becomes a new myth, and turns on human beings. Their evidence is the century they were living in: the most technically and scientifically advanced societies producing industrialised mass killing (5.6, and Bauman's Modernity and the Holocaust in 5.13).

Foucault (5.9) makes a related but distinct argument: the Enlightenment's humane reforms — the asylum, the modern prison, public health, the school — were also the construction of new apparatuses of classification, surveillance and normalisation. Beccaria's rationalised punishment is, on this reading, not merely more humane than the scaffold but a more thorough form of control.

And the postcolonial critique (6.7): the claim to universal reason was made from a particular place, and functioned as a warrant for classifying other societies as unenlightened and therefore in need of tutelage. The "civilising mission" is an Enlightenment argument.

The exclusions, and the arguments made against them at the time

An honest account must record both.

Women were largely excluded from the institutions of the Republic of Letters, and several major figures wrote explicitly of women's lesser rational capacity. And the counter-arguments were made then, in Enlightenment terms: Mary Wollstonecraft's A Vindication of the Rights of Woman (1792) argues that women's apparent deficiencies are the product of an education designed to produce them — a straightforwardly sociological claim (2.3.5). Olympe de Gouges published a Declaration of the Rights of Woman in 1791 and was guillotined in 1793. Condorcet argued for women's full political rights in 1790.

Race: the racial writings of Hume, Kant and others are documented and substantial. And the anti-imperialist strand was also Enlightenment: Diderot's contributions to Raynal's History of the Two Indies contain sustained attacks on colonial conquest; Kant's later Perpetual Peace condemns the "inhospitable conduct" of the commercial states towards the peoples they visit; Herder rejected the ranking of peoples on a single scale of civilisation.

The point is not to balance a ledger. It is that the Enlightenment was an argument, not a doctrine (2.1.7) — and that the resources used against its exclusions were frequently drawn from within it.

What the founders inherited

To be precise about the transmission into Part 4:

From the premise that society is lawful: Comte's positivism (3.3.1) and Durkheim's social facts (4.2). From political arithmetic: the statistical tradition, Quetelet, and Durkheim's Suicide. From the reform impulse: applied and policy sociology (12.2), and the founding of the discipline as a would-be science of improvement. From the idea of progress: the evolutionary theories of Comte and Spencer (3.3), and their long afterlife in modernisation theory (11.1). And from the critique: Weber's rationalisation and the iron cage (4.3), the Frankfurt School (5.6), Foucault (5.9), and Part 6 in its entirety.

Sociology is, on this account, the Enlightenment's science of society and its most persistent internal critic. Holding both is not a contradiction; it is the discipline's actual position.

"The Enlightenment was one doctrine." It was a contested argument across several countries and a century, containing radicals and moderates, believers and atheists, imperialists and anti-imperialists.

"The Enlightenment was simply reason against superstition." That is the movement's own account of itself, and 1.5.2 tells you what to do with an institution's self-description.

"Its racism and sexism were incidental." They were substantial and documented — and were contested at the time, in Enlightenment terms, by Wollstonecraft, de Gouges, Condorcet, Diderot and Herder.

"The critique of Enlightenment means rejecting reason." Adorno, Horkheimer and Foucault were all doing rational critical analysis. The target is a particular conception — instrumental reason, or reason as unmarked universality — not enquiry.

"Haiti is a footnote to the Age of Revolution." It was the only successful revolution of the enslaved, and its marginalisation in the historical record is Trouillot's subject and a finding in its own right.

"Progress is an Enlightenment fact." It is an Enlightenment belief, and 1.2.3 established that change is not progress by definition.

Why it matters

It supplies sociology's founding premise. Everything in this course rests on the claim that social arrangements have causes and can be investigated. That claim has a history, and this is it.

It supplies the reform impulse and its dangers together. The belief that society can be improved by knowledge is what makes applied sociology possible and what makes 12.2's cautionary history necessary.

It gives you the statistical tradition. Graunt counting deaths in London is the direct ancestor of every rate in Part 7 — and of Durkheim's discovery that a suicide rate is a social fact.

And it establishes the discipline's double position. Sociology is a product of the Enlightenment and its most searching critic. If that sounds like a contradiction, notice that 1.5.3 asked exactly this of you: apply the framework to yourself. The discipline does, and this is where that self-application begins.

The Lisbon earthquake of 1755 forced a catastrophe to become a problem for enquiry rather than for theology — the shift that makes a science of society possible.

The Enlightenment (c. 1680–1800) held that nature is lawful and knowable, that reason and evidence are the proper warrants for belief, that society is likewise investigable, that human beings are educable, and that progress by deliberate reform is possible. Kant: sapere aude.

Four legacies for sociology: society as an object of science; knowledge as collective and public (the Encyclopédie, the Republic of Letters, Habermas's public sphere); institutional reform as applied science (Beccaria on certainty over severity — the founding text of classical criminology); and political arithmetic (Graunt's bills of mortality, Petty, later Quetelet) — the origin of social statistics and of the finding that aggregate regularities are invisible at the individual level.

The Haitian Revolution (1791–1804) took the universalism at its word; Trouillot shows it was unthinkable within available categories and was subsequently silenced — a study of how categories determine what can be perceived and recorded.

The critiques come from inside sociology: Adorno and Horkheimer on instrumental reason, Foucault on reform as classification and normalisation, and the postcolonial critique of universality claimed from a particular place.

The exclusions were real and were contested at the time, in Enlightenment terms — Wollstonecraft, de Gouges, Condorcet, Diderot, Herder. The Enlightenment was an argument, not a doctrine.

Enlightenment — the eighteenth-century movement holding that nature and society are lawful, knowable by reason and evidence, and improvable.

Sapere aude — "dare to know"; Kant's motto for emergence from self-incurred immaturity.

Republic of Letters — the transnational network of correspondence, journals and academies through which Enlightenment ideas circulated.

Encyclopédie — Diderot and d'Alembert's collective compilation of knowledge, including the crafts.

Public sphere — the arena of reasoned public discussion whose emergence Habermas traced to this period (5.6).

Classical criminology — Beccaria's programme of proportionate, certain, codified punishment justified by deterrence (10.2).

Political arithmetic — Petty's term for reasoning about social and state affairs in number, weight and measure.

Bills of mortality — London's death records, analysed by Graunt to reveal aggregate regularities.

Instrumental reason — reason concerned only with efficient means, indifferent to ends (Adorno and Horkheimer).

Silencing — Trouillot's account of how available categories determine what enters the historical record.

One — the Lisbon test. Take a recent disaster. List the explanations offered, and sort them: natural cause, social arrangement, moral judgement. Rousseau's reply to Voltaire is a template — how much of the damage was built rather than shaken?

Two — find the political arithmetic. Identify one rate published about your society — mortality, crime, unemployment, literacy. Find out who collects it, since when, and why the collection began. Most such series began for administrative reasons that shaped what they measure.

Three — apply Beccaria. Take one penalty in your society and ask which does more work: its severity or the probability of being caught. Then ask which of the two policy actually invests in.

Four — the unthinkable. Identify one claim that is currently dismissed not because the evidence is weak but because it does not fit available categories. This is a demanding exercise and it is Trouillot's, applied to the present.