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The state of nature is a thought experiment describing human life absent political institutions and enforceable law. Hobbes depicts it as a 'war of all against all' — brutish, solitary, and short — while Locke imagines it as governed by natural law and reason, and Rousseau sees it as a condition of innocent freedom corrupted by civilization. The concept is used to justify (or challenge) the transfer of natural freedom to political authority. What one assumes about the state of nature largely determines what political institutions one endorses.
Compare the three canonical accounts side by side — Hobbes's Leviathan Part I, Locke's Second Treatise Ch. 2, and Rousseau's Discourse on Inequality — noting how each philosopher's anthropology drives their political conclusions. Then ask: is the state of nature descriptive (what humans were like), normative (what they deserve), or purely hypothetical (a device for justification)?
The state of nature is a thought experiment — your prerequisite in that genre established the philosophical method: strip away some feature of the actual world and ask what follows for the question you're examining. Here the feature stripped away is political institutions and enforceable law. The result is a powerful device for isolating what political authority is supposed to provide and what moral constraints it must respect. Three canonical accounts produce three very different pictures, each reflecting a distinct set of background assumptions about human nature.
Hobbes starts with psychology. In the state of nature, humans are roughly equal in body and mind — the weakest can kill the strongest by cunning or coalition. From that rough equality, a devastating logic unfolds: equality generates competition (two people want the same scarce resource), competition generates diffidence (I must strike preemptively before you strike me), and diffidence generates glory-seeking (I need a reputation for toughness to deter attackers). The equilibrium is a war of all against all — not constant violence, but a permanent condition where violence is always possible and no one can safely invest in production, agriculture, or long-term cooperation. Hobbes's famous conclusion: life is "solitary, poor, nasty, brutish, and short." Crucially, this is not a pessimistic claim about human vices but a nearly game-theoretic argument: even rational, decent people reach this equilibrium because the situation has the structure of a multi-player prisoner's dilemma. No individual can escape it by unilateral restraint. The conclusion Hobbes draws is that we need an absolute sovereign who can credibly enforce agreements and dissolve the dilemma.
Locke's state of nature is dramatically more hospitable. Natural law — discoverable by reason — already governs pre-political life: it prohibits murder, theft, and assault and grounds natural rights to life, liberty, and property. People in Locke's state of nature can cooperate, trade, and accumulate property; it is inconvenient but not catastrophic. The specific inconvenience is the absence of a common judge: when disputes arise, each party judges its own cause, which invites partiality and escalation. This narrower diagnosis generates a narrower prescription: we need an impartial arbitrator with the authority to settle disputes and enforce judgments — not an absolute sovereign, but a limited government whose mandate is to protect the natural rights that pre-existed it. If government violates those rights, the social contract is dissolved and the right of revolution is triggered. Locke's state of nature, in other words, constrains what legitimate government can do.
Rousseau upends both pictures. His natural human is pre-social and pre-rational: without language, without property claims, without the vanity that comes from comparing oneself to others. Natural needs are simple and easily satisfied; natural humans barely encounter one another. The state of nature is peaceful not because reason governs it but because there is almost no occasion for conflict. What corrupts humanity is not the absence of government but *civilization itself*: the institution of property creates inequality, inequality creates dependence, dependence creates the spiral of pride, envy, and domination. The state of nature is innocent not because it is good but because the specifically social vices don't exist there. This doesn't mean Rousseau wants to return to it — that would be absurd, like trying to unlearn language. His project in *The Social Contract* is to design political institutions — governed by the general will rather than private interests — that preserve collective freedom in a necessarily social world.
The thought experiment's purpose is normative, not historical. None of these philosophers were making archaeological claims about prehistoric life. The state of nature is a normative baseline: it isolates the values at stake — security, rights, equality, freedom — and asks what rational persons would accept as the basis for political authority. What political institutions must provide, what moral limits they must respect, and what grounds citizens have for obedience all depend on what you think the state is improving upon. That's why your competing intuitions about government's proper role very often trace back, at root, to competing visions of the state of nature.
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