wrote the "leviathan" during the civil war so he came to the idea that people are bad; said man is born materialistic and egotistical, and that life is "nasty, brutish, and short"; original human state was pure freedom - chaotic and horrible, every man against man; said you needed a social contract (giving up freedom) to become civil and safe (power comes from the people ruling, not god) - replaced divine right to kings; ruler had to impose order and safety; no rebelling