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Steeped in the Latin of Roman law, Europe’s jurists branded this agreement the pactum societatis. In their minds, it marked the birth of legitimate government. A couple of centuries later, Jean-Jacques Rousseau gave it a more famous name: the social contract. It’s not based on a signed piece of paper or original physical act. Like the axis of Galileo’s rotating earth, the social contract is imaginary, but it is still there, exerting its influence and power. Like any contract, it imposes obligations both on me and on my rulers.
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Arthur Herman (The Cave and the Light: Plato Versus Aristotle, and the Struggle for the Soul of Western Civilization)