text: In this language, a first book on rightness, a second book on expediency, and a third book on the conflict between rightness and expediency make up a treatise On Moral Duties.
full_question: In this language, a first book on rightness, a second book on expediency, and a third book on the conflict between rightness and expediency make up a treatise On Moral Duties. At the end of a political theory text in this language, a general dreams of his grandfather's spirit showing him nine spheres full of stars. A six-book philosophical poem in this language concluded that the mind and soul dissolve quickly after their conjoined body dies, and popularized an older idea that free will derives from the unpredictable "swerve" of atoms falling in an infinite void. That poem, On the Nature of Things, was rediscovered by Poggio in 1417. For 10 points, name this language used by Lucretius, in which the "Dream of Scipio" was written to conclude De Re Publica by Cicero.
first_sentence: In this language, a first book on rightness, a second book on expediency, and a third book on the conflict between rightness and expediency make up a treatise On Moral Duties.
raw_answer: Latin [or lingua latina]