This edition of the Latin text, with accompanying commentary, of the first book of Cicero's essay, On the Nature of the Gods comprises an exposition and refutation of the theology of the Epicurean philosophical school as well as a history of ancient reflections on the gods. Prefaced to the dialogue is Cicero's general justification for writing on philosophy. In his introduction, Andrew Dyck analyzes the work in the context of Cicero's intellectual development and of ancient views of the deity.