Enlightenment and knowledge · 1651 onward
The social contract
Overview
Fair rules are the ones free and equal people could agree to. Liberty, consent and fairness are tested against that agreement.
The social contract tradition asks what justifies political authority. Hobbes imagined a state of nature so dangerous that anyone would accept a ruler who could keep the peace. Locke argued that people consent to government to protect their lives, liberty and property, and may withdraw that consent from a ruler who breaks the terms. Rousseau asked how a people could obey and still be free.
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Rawls gave the idea a modern test, the veil of ignorance. Choose the rules of a society without knowing whether you will be rich or poor, strong or weak, in the majority or a minority. Rules you would pick from behind the veil are likely to be fair. Mill’s harm principle is often set beside it, though Mill did not rest it on a contract: liberty may be limited to prevent harm to others, not merely because others disapprove.
Critics note that no one signed the contract, that the veil assumes a particular kind of reasoner and that the model can overlook people outside the agreement. The habit worth keeping is simple: when a rule is imposed on people, ask what they could accept, and what they would say if they could reply.
Where it answers
Who should govern?
Authority is justified by terms free people could accept, and rules are fair if chosen without knowing your own place.
How should we act?
Right conduct includes rules you could defend to anyone they affect.
Key terms
- State of nature
- Life imagined before government, used to ask why we accept one.
- Consent
- The agreement of the governed, which makes political power legitimate.
- General will
- Rousseau’s term for what a people wills for the common good, not just the sum of private wants.
- Veil of ignorance
- Rawls’s test: choose principles of justice without knowing your own place in society.
- Harm principle
- Mill’s rule that power over someone is justified only to prevent harm to others. Mill was not a contract thinker; his rule is taught here as a limit on what any agreement may impose.
In their words
“The life of man, solitary, poor, nasty, brutish, and short.”
Further reading
- Leviathan · Thomas Hobbes
- Two Treatises of Government · John Locke
- The Social Contract · Jean-Jacques Rousseau
- A Theory of Justice · John Rawls
- On Liberty · John Stuart Mill
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A plain reference you can paste into notes or an essay:
Quest2Reason. “The social contract.” https://quest2reason.com/learn/ideas/contract. Accessed 13 November 2026.