Thomas Hobbes, the royalist, is above all famous for his 'social contract theory', the appeal to the agreement that would be made among rational, free, and equal persons. His conclusion - that we should submit to the authority of an absolute and unlimited sovereign power - may not have found followers, but his analysis remains unchallenged. John Locke, by contrast, was a parliamentarian. He argued that sovereignty resides with the people, and that the state is supreme only when bound by civil and natural law. It follows that revolution is not only a right, but sometimes an obligation. He was a strong supporter of religious freedom, and of a system of checks and balances in government. Many of his ideas were later embodied in the US constitution.
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