John Locke

By Lucía Cárdenas

John Locke was born in 1632, the year of Galileo's trial's aftermath and England's slide toward civil war, and his life tracks the making of modern liberty. A physician and philosopher, he served the Earl of Shaftesbury, the great Whig opponent of Stuart absolutism, and when Shaftesbury fell, Locke fled to Holland in 1683 under suspicion of treason. He returned in the wake of the Glorious Revolution of 1688 — and then, in an astonishing burst, published the works that would define liberalism: the Two Treatises of Government and the Essay Concerning Human Understanding in 1689, the Letter Concerning Toleration the same year.

The Second Treatise is the more explosive book. Against the doctrine that kings rule by divine right, Locke argued that in the state of nature men are free and equal, endowed with natural rights to life, liberty, and property. Governments are instituted by consent, as trustees of those rights; property itself arises from mixing one's labor with nature — the farmer who tills the field owns its fruits. And crucially: when government systematically violates the trust, the people retain the right of revolution. It was a philosophical justification of 1688 written after the fact — and a loaded weapon handed to every future generation. The American Declaration of Independence is Locke translated into politics: "life, liberty and the pursuit of happiness" is his trinity with property politely renamed.

The Essay Concerning Human Understanding attacked the other pillar of the old order: innate ideas. The mind, Locke argued, is at birth a tabula rasa — a blank slate — and all knowledge comes from experience and reflection. If no truths are stamped on the soul by God or nature, then no authority can claim privileged access to them; priests and kings lose their epistemological monopoly. It was the philosophy of empiricism, and quietly, the philosophy of equality: minds are made, not born, so education and institutions matter enormously.

The Letter Concerning Toleration argued that the magistrate's power extends only to civil interests, not to souls; genuine faith cannot be compelled, so persecution is both irrational and impious. Locke's toleration had limits — he excluded atheists, whose oaths he thought worthless, and Catholics, whom he suspected of foreign allegiance — but the principle outgrew its author's prejudices and became the foundation of religious liberty.

Locke died in 1704, honored and influential. His afterlife is the modern world: constitutional government, the consent of the governed, property rights, religious toleration, empiricist science, the belief that minds are shaped by experience and therefore that education can remake society. Liberalism's entire grammar — rights, consent, limits, toleration — is Locke's vocabulary. Few philosophers have had so direct a hand in the design of actual governments; the American founders, the French revolutionaries, and every constitution written since have spoken, knowingly or not, in his sentences.

Impact on civilization

Locke supplied the philosophical operating system of liberal democracy. The Two Treatises gave constitutional government its canonical justification — natural rights, consent of the governed, the right of revolution — directly shaping the American Declaration of Independence, the French Declaration of the Rights of Man, and the constitutional tradition worldwide. His labor theory of property underwrote both classical liberal economics and, by inversion, the socialist critique of it: Marx's theory of exploitation is Locke's labor theory turned against the owners. The Essay's empiricism and tabula rasa became the epistemology of modern science and the philosophical basis for universal education — if minds are made by experience, then schooling is the great lever of human improvement. The Letter Concerning Toleration founded the modern doctrine of religious liberty and the separation of church coercion from state power. Taken together, Locke's works defined the default settings of the modern state: limited government, individual rights, consent, toleration. Three centuries of constitutions, bills of rights, and human-rights declarations are footnotes to his pages.