WorkImmanuel Kant

Perpetual Peace: A Philosophical Sketch

Kant's 1795 blueprint for ending war, cast as a mock peace treaty: republics, a league of nations, a right of hospitality for every stranger.

by Immanuel Kant139 passages held

German, the original language

Original title: Zum ewigen Frieden: Ein philosophischer Entwurf
First published: 1795(aged 71)
Original language: German

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Overview

Kant took the title as a joke against himself. "To perpetual peace," he says at the outset, was the legend a Dutch innkeeper had painted over a picture of a graveyard — the only lasting peace being the one under the ground. Then he wrote the essay as though peace among the living were a serious proposal, and cast it in the driest possible form: a treaty. The occasion was real. In 1795 Prussia had just signed the Treaty of Basel with revolutionary France, and Kant, seventy-one, used the moment to set out the conditions under which nations might stop merely pausing between wars. Six "preliminary articles" clear the ground — abolish standing armies over time, stop meddling in other states' constitutions, contract no debts for war, sign no peace that secretly reserves the next one. Three "definitive articles" build the thing: every state's constitution must be republican, so that the people who pay for wars have a say in declaring them; the states must join a federation that keeps their freedom while outlawing war between them; and a cosmopolitan right must guarantee any stranger a welcome, not as charity but as a claim. Kant is insistent that this is a task, not a prophecy. The little book outran its century. Its architecture — republics, a league of nations, a law standing above states — runs straight through to the League of Nations and the United Nations, and political scientists still test its claim that republics rarely go to war with one another.

Key concepts

What is the difference between the 'preliminary' and 'definitive' articles?

The six preliminary articles clear the ground for peace — abolish standing armies over time, contract no war debts, do not interfere in other states' constitutions, sign no treaty that secretly reserves the next war. The three definitive articles then build it: republican constitutions, a federation of free states, and a cosmopolitan right of hospitality. Kant casts the whole thing as a mock treaty.

Why must every state's constitution be 'republican'?

Because a republican constitution gives the people who actually pay for wars — in blood, taxes and ruin — a voice in declaring them, and they hesitate as a ruler bearing none of the cost does not. By republican Kant means representative government with a separation of powers, which he carefully distinguishes from direct democracy, not simply the absence of a king.

What does Kant mean by cosmopolitan right, or 'hospitality'?

Cosmopolitan right is the right of any stranger not to be treated as an enemy simply for arriving on another's soil — a right to visit and to offer to engage, though not a right to settle or to be taken in. Kant grounds it in the shared possession of the earth's surface, making it a genuine claim rather than mere charity.

What is the 'guarantee' of perpetual peace Kant offers?

Kant argues that nature itself works toward peace: it has spread humans across the earth and then driven them together, and it turns their very self-interest and antagonism into pressure for lawful order — enough that even a 'nation of devils,' if they are intelligent, would be forced to it. The guarantee makes peace probable, never certain; it remains a task, not a prophecy.

Themes of the book

What this book returns to, gathered into themes and ordered by how much of the text each one occupies.

A Treaty Against War

What would it take for nations to stop merely pausing between wars — and can lasting peace be written into law rather than left to the good will of princes?

Cast as a mock peace treaty, the essay sets out the conditions under which states might end war rather than postpone it. Six preliminary articles clear the ground — no standing armies in time, no meddling in others' constitutions, no debts contracted for war; three definitive articles build the thing: every constitution republican, so those who pay for wars have a say in declaring them; a federation of free states outlawing war between them; and a cosmopolitan right of hospitality owed every stranger as a claim, not charity. Kant insists it is a task, not a prophecy — and its architecture reached the twentieth century intact.

publicity
freedom
morality
human nature
nature
reason
international law

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Within this work

passages held: 139
distinct concepts: 213
by passages held, corpus-wide: #160

What this book thinks together

Every arc around the wheel is one concept in this book. A ribbon joins two the text reaches for together, and its width is how many of its passages hold both. Strongest: metaphysics with reason.

Concept co-occurrence, strongest first 8 concepts, joined by 16 pairings. 86 shared passages in all. 84 weaker pairings reach beyond these concepts and are not drawn.
Concept	Paired concept	Shared passages
metaphysics	reason	16
causality	freedom	10
epistemology	reason	9
causality	determinism	6
logic	reason	6
causality	metaphysics	5
determinism	freedom	5
experience	reason	5
epistemology	metaphysics	4
experience	metaphysics	4
freedom	metaphysics	4
logic	metaphysics	4
causality	reason	2
epistemology	experience	2
epistemology	logic	2
freedom	reason	2

Works held

The author's work in order, this book marked in place. Your-language title first, the original beneath it where the two differ; side chips show which full texts are held.

1764 Inquiry Concerning the Distinctness of the Principles of Natural Theology and Morality (Untersuchung über die Deutlichkeit der Grundsätze der natürlichen Theologie und der Moral)
Kant's runner-up entry in the Berlin Academy's prize contest, and the sharpest of the pre-critical essays: it already sets philosophy's method against mathematics', the problem the first Critique would finally resolve.
DE
1764 Observations on the Feeling of the Beautiful and Sublime (Beobachtungen über das Gefühl des Schönen und Erhabenen)
The popular essay of Kant's pre-critical years, twenty-six years before the Critique of Judgement gave taste a rigorous grounding; its remarks on race and sex now drive much of the scholarship on him.
DE
1766 Dreams of a Spirit-Seer, Elucidated by Dreams of Metaphysics (Träume eines Geistersehers, erläutert durch Träume der Metaphysik)
The anonymous, ironic book of 1766 in which Kant's faith in speculative metaphysics visibly collapses — the clearing of the ground that the first Critique, fifteen years later, would build on.
DE
1781 The Critique of Pure Reason (Kritik der reinen Vernunft)
The book at the centre of everything after it: the first of the three Critiques, revised almost past recognition for its 1787 second edition, and the work the Prolegomena was written to explain.
DEEN
1784 An Answer to the Question: What Is Enlightenment? (Beantwortung der Frage: Was ist Aufklärung?)
The most quoted thing Kant wrote, and among the shortest: a 1784 magazine answer to a question a Berlin pastor had left hanging, and the defining slogan of the German Enlightenment.
DE
1784 Idea for a Universal History with a Cosmopolitan Purpose (Idee zu einer allgemeinen Geschichte in weltbürgerlicher Absicht)
The essay where Kant first treats history as more than chronicle — nine propositions arguing it has a hidden rational shape; the seed of Perpetual Peace, and a device Hegel later took over.
DE
1785 Fundamental Principles of the Metaphysic of Morals (Grundlegung zur Metaphysik der Sitten)
The short, deliberately preliminary book that isolates the categorical imperative before building anything on it; three years later the Critique of Practical Reason would give the same moral law its fuller grounding.
DEEN
1786 What Does It Mean to Orient Oneself in Thinking? (Was heißt: sich im Denken orientieren?)
An intervention in the pantheism controversy that split the German Enlightenment: written months after Mendelssohn's death, it stakes out a rational faith between dogmatic proof and Jacobi's leap.
DE
1788 The Critique of Practical Reason (Kritik der praktischen Vernunft)
The second of the three Critiques, and Kant's reply to those who doubted the Groundwork's freedom; it introduces the fact of reason and the postulates of God and immortality.
DEEN
1793 Religion within the Boundaries of Mere Reason (Die Religion innerhalb der Grenzen der bloßen Vernunft)
The book that got Kant ordered to stop writing on religion: four essays, from 1793, rebuilding Christian doctrine on reason and consigning revelation and clergy to what Kant called counterfeit service.
DE
1795 Perpetual Peace: A Philosophical Sketch (Zum ewigen Frieden: Ein philosophischer Entwurf) you are here DE
1797 Einleitung in die Rechtslehre
The framing section of the Doctrine of Right, the legal half of Kant's 1797 Metaphysics of Morals; it defines a right through freedom alone and ties every right to a power to coerce.
DE
1798 Von der Macht des Gemüts, durch den bloßen Vorsatz seiner krankhaften Gefühle Meister zu sein
The third part of Kant's late Conflict of the Faculties (1798), written as a reply to the physician Hufeland — a philosopher's dietetics, and his most personal page on governing the body through the mind.
DE
1803 Lectures on Pedagogy (Über Pädagogik)
One of the last books to appear under Kant's name (1803), though his editor Rink built it from lecture notes; the fullest record of Kant on education, and of his debt to Rousseau.
DE
Critique of Judgement
The book the Romantics and the German Idealists built on: Kant's 1790 account of beauty and of purpose in nature, written to bridge the gulf that had opened between his first two Critiques.
DEEN
Prolegomena to Any Future Metaphysics
Written to salvage the Critique of Pure Reason after its baffled reception, this shorter 1783 restatement runs the same argument in reverse, and became most readers' first encounter with Kant.
DEEN
The Metaphysical Elements of Ethics (Die Metaphysik der Sitten)
Long read as a mere appendix to the Groundwork, this ethical half of the 1797 Metaphysics of Morals is where Kant spells out the duties of virtue; later Kantians recovered it as his theory of character.
DEEN

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