Begin from human nature.
Hobbes builds his politics on a picture of man as matter in motion, driven by appetite, aversion, and the restless pursuit of power. He insists we understand the parts, sense, passion, and reason, before judging the whole.
Understand in about 5 minutes
Leviathan
Hobbes argues that without a common power to keep all in awe life collapses into a war of every man against every man, and that the cure is a sovereign created by the consent of all.
Mind Map
Map of the book's core ideas
Core Message
What the book is really saying
Without a common power, war.
Where no shared authority keeps people in awe, each has a right to everything and trusts only his own strength, so the natural condition is a war of every one against every one in which life is poore, nasty, brutish, and short.
Reason discovers terms of peace.
The same fear and reason that drive the war also point the way out. The laws of nature are rules found by reason: seek peace where it can be had, and lay down the right to all things if others will do the same.
Peace requires a sovereign.
Covenants without the sword are only words. To make peace hold, a multitude must transfer their power to one man or assembly whose will counts as the will of all, and authorise its acts as their own.
Summary
The essence in plain English
Leviathan opens not with politics but with man. Hobbes treats human beings as bodies in motion, explaining sense, imagination, speech, passions, and reason as mechanical processes. From this he derives a restless creature who pursues felicity as the continual satisfaction of desire and who, lacking a final goal, seeks power after power. This materialist account of human nature is the foundation on which the whole argument about the commonwealth is built.
He then describes the natural condition of mankind. Because people are roughly equal in strength and cunning, and compete for the same scarce goods, each distrusts the others and strikes first for safety or glory. Where there is no common power to keep them all in awe, the result is a war of every one against every one, in which there is no industry, no culture of the earth, no society, and the life of man is solitary, poore, nasty, brutish, and short.
The way out lies in reason and fear together. Hobbes lays down laws of nature, rules discovered by reason that forbid a man to destroy his own life. The first and fundamental is to seek peace as far as it can be had; the second is to lay down the right to all things, so far as others will do likewise, and to be content with as much liberty against others as one would allow them against oneself. Justice itself begins only once such covenants are made.
But covenants without the sword are only words. To make the laws of nature reliably binding, the natural right that each man holds must be transferred to a common power. A commonwealth is instituted when a multitude agree and covenant, every one with every one, to authorise the actions of one man or one assembly as if they were their own. This act generates the sovereign, the great Leviathan, a mortal god to whom they owe their peace and defence.
The later books extend the argument beyond the civil sovereign. Hobbes turns to a Christian commonwealth, reinterpreting Scripture and prophecy to argue that spiritual and temporal authority must not be divided, and finally to the Kingdome of Darknesse, his attack on the misuse of religion and false philosophy that, he claims, breed sedition and undermine the peace the commonwealth exists to secure.
Key Concepts
The ideas to keep
The Natural Condition
Without a common power, equal and fearful people fall into a war of every one against every one.
Why it matters
It is Hobbes's case for why any settled authority is preferable to the violence and insecurity of having none.
Laws of Nature
Rules found out by reason that forbid self-destruction and command the pursuit of peace and reciprocal restraint.
Why it matters
They show that the escape from war is rational, not merely imposed, and supply the moral ground of covenants.
The Sovereign
One man or assembly to whom a multitude transfer their power, whose will is authorised as the will of all.
Why it matters
It is Hobbes's engine of peace: only an undivided power can make covenants binding and keep the war from returning.
Mental Models
Reusable ways to think
Covenants Need a Sword
Promises hold only when some power can enforce them; agreements without enforcement are merely words.
How it helps
It explains why trust, contracts, and rules tend to fail wherever no shared authority can compel performance.
Power After Power
Because there is no final satisfaction, people pursue an ever-growing store of power to secure what they already have.
How it helps
It frames competition and insecurity as endemic to desire, not as a flaw in particular people.
Authorisation
A multitude becomes one when each authorises a representative's acts as his own, making the sovereign's deeds theirs.
How it helps
It offers a way to see how scattered individuals can be bound into a single body that can act and be held responsible.
Selected Quotes
Short passages from the source
And the life of man, solitary, poore, nasty, brutish, and short.
Covenants, without the Sword, are but Words, and of no strength to secure a man at all.
This is the Generation of that great LEVIATHAN, or rather (to speake more reverently) of that Mortall God, to which wee owe under the Immortall God, our peace and defence.
Source
Text used for this page
Source text: Project Gutenberg edition of Leviathan by Thomas Hobbes.
HTML text: https://www.gutenberg.org/cache/epub/3207/pg3207.txt
Project Gutenberg states that this ebook is for use at no cost with almost no restrictions in the United States and most other parts of the world, subject to local law.
First published 1651; the Project Gutenberg edition preserves Hobbes's original seventeenth-century spelling.