The political Works, written by Thomas Hobbes, described his views on how humans could thrive in harmony while avoiding the perils and fear of societal conflict. His experience during a time of upheaval in England influenced his thoughts, which he captured in The Elements of Law , De Cive (On the Citizen), Behemoth, or The Long Parliament and his most famous work, Leviathan. Leviathan, published in 1651, concerns the structure of society and legitimate government, and is regarded as one of the earliest and most influential examples of social contract theory. Written during the English Civil War (1642–1651), Leviathan argues for a social contract and rule by an absolute sovereign. Hobbes wrote that civil war and situations identified with a state of nature and the famous motto Bellum omnium contra omnes ("the war of all against all") could only be averted by strong central government. De Cive ('On the citizen') was Hobbes's first published book of political philosophy. Thomas Hobbes was an English philosopher who is considered one of the founders of modern political philosophy.