For 10 points, name this work which characterizes life as "solitary, poor, nasty, brutish and short," a book by Thomas Hobbes.
This work concludes by mentioning a Roman judge who would ask accusers cui bono. Its first section, "Of Man," gives competition, diffidence and glory as the three causes of conflict, while its middle two sections discuss commonwealths and Christian commonwealths, respectively, and its fourth and final section is concerned with a "confederacy of deceivers" called the kingdom of darkness. This work argues that only a strong sovereign can prevent a war of all against all. For 10 points, name this work which characterizes life as "solitary, poor, nasty, brutish and short," a book by Thomas Hobbes.
This work concludes by mentioning a Roman judge who would ask accusers cui bono.
 Leviathan