According to thomas hobbes social contract, citizens exchange rights for &

  security & stability

Explanation/detail:

Thomas Hobbes published a famous work called Leviathan in 1651.  The title "Leviathan" comes from a biblical word for a great and mighty beast.  Hobbes believed government is formed by people for the sake of their personal security and stability in society.  In Hobbes view, once the people put a king (or other leader in power), then that leader needs to have supreme power (like a great and mighty beast).    Hobbes' view of the natural state of human beings without a government held that people are too divided and too volatile as individuals -- everyone looking out for his own interests.  So for security and stability, authority and the power of the law needs to be in the hands of a powerful ruler like a king or queen.  And so people willingly enter a "social contract" in which they live under a government that provides stability and security for society.

Probably the most famous set of lines from Hobbes' Leviathan book describes what he saw as the natural state of human affairs without government -- one in which every individual had freedom, but that meant it was a situation of "war of all against all," or we might say, every man for himself.  Hobbes wrote:

b toward the volcano.landward. the landward side of something is the side nearest to the land or facing the land, rather than the sea.

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