The Enlightenment & the Philosophes

You’ll be able to

Explain how Enlightenment thinkers applied reason to society, politics, and economics
Identify the major philosophes and their core ideas
Analyze competing Enlightenment views of government and human rights

Reason applied to humanity

The Enlightenment (c. 1687–1789) took the Scientific Revolution’s faith in reason and applied it to human affairs — society, politics, law, and economics. Its thinkers, the French philosophes, believed that just as Newton found natural laws, reason could reveal the laws governing human society and be used to reform it toward progress. They championed reason, natural rights, religious toleration, and freedom of thought, and attacked superstition, censorship, and arbitrary power. Immanuel Kant captured the spirit in the motto "Sapere aude" — "Dare to know."

The philosophes and their ideas

A brilliant generation transformed European thought. Earlier, Thomas Hobbes (Leviathan) argued that in the chaotic state of nature people surrender power to an absolute sovereign for security, while John Locke countered that government exists to protect natural rights — life, liberty, and property — and rests on the consent of the governed. Voltaire crusaded for religious toleration and freedom of speech against the Church. Montesquieu, in The Spirit of the Laws, proposed the separation of powers and checks and balances. Rousseau, in The Social Contract, argued that legitimate government expresses the general will of the people ("Man is born free, and everywhere he is in chains"). Diderot compiled the Encyclopédie to spread all this knowledge.

New ideas in economics and rights

Enlightenment reason reshaped economics and social debate. Adam Smith’s The Wealth of Nations (1776) attacked mercantilism and argued for laissez-faire — free markets guided by an "invisible hand" that let self-interest produce prosperity. Cesare Beccaria condemned torture and the death penalty, founding modern criminal-justice reform. A few thinkers pushed toward equality of the sexes: Mary Wollstonecraft, in A Vindication of the Rights of Woman (1792), argued that women possessed the same capacity for reason as men and deserved equal education and rights — an early landmark of feminist thought, though most philosophes ignored or dismissed women’s equality.

Tip

Anchor each philosophe to one idea: Locke = natural rights and consent; Montesquieu = separation of powers; Voltaire = toleration and free speech; Rousseau = the general will; Smith = laissez-faire; Wollstonecraft = women’s rights. These one-liners answer most identification questions.

Worked example

Contrast Hobbes’s and Locke’s views on the purpose of government, and explain how Locke’s ideas could justify resistance to a ruler.

1.State Hobbes’s view: in the violent state of nature, people give up their rights to an absolute sovereign in exchange for order and security, and should not rebel.
2.State Locke’s view: government is a contract created to protect natural rights — life, liberty, and property — and rests on the consent of the governed.
3.Draw the contrast: Hobbes justifies strong, even absolute, authority, while Locke makes government conditional and limited.
4.Reach the implication: because Locke ties legitimacy to protecting rights and to consent, a government that violates those rights breaks the contract, giving the people the right to resist or replace it.

Answer: Hobbes argued that people escape the brutal state of nature by surrendering power to an absolute sovereign for security, so rebellion is unjustified. Locke argued instead that government exists to protect natural rights (life, liberty, property) and depends on the consent of the governed. Because Locke makes legitimacy conditional on protecting rights, a ruler who violates them breaks the social contract, justifying the people’s right to resist or overthrow the government.

Checkpoint

Montesquieu’s most influential political idea, later reflected in the U.S. Constitution, was:

Watch out

The Enlightenment was not uniform. Hobbes used reason to defend absolute authority, while Locke and Rousseau used it to justify limited or popular government. And most philosophes did not extend equality to women — Wollstonecraft was a notable exception, not the consensus.

Checkpoint

In *The Wealth of Nations*, Adam Smith argued that economic prosperity is best achieved through:

On the exam

Enlightenment ideas are the intellectual fuel for later revolutions. When a prompt asks about the causes of the American or French Revolutions, cite Locke’s natural rights and consent and Rousseau’s popular sovereignty as direct influences on revolutionary demands.

Answer the 2 checkpoints as you read.