Friedrich Solmsen’s book is a thorough exploration of Plato's ideas about God and religion. Solmsen focuses on Plato’s theology primarily as it is presented in Book 10 of the Laws, a work previously neglected as a source of Plato's conception of religion because of its problematic place within fifth-century discussions of new legal provisions concerning offences against the gods. The author, by way of introduction, outlines the role religion had played in the old Greek city-states, emphasizing the fact that there had been no religion of a nonpolitical character, and describes the way the old religion had been destroyed by the "Enlightenment" of the fifth century. Solmsen then traces the development of Plato's religious ideas, addressing such topics as Plato as the expurgator and reformer; his theological approach; the philosophy of movement; and the role of the Soul as the source of all movement. Plato's later religious philosophy, Solmsen shows, is marked by a more lenient attitude towards popular and poetic religion. He characterizes Plato's later thinking on religion, as disclosed in Book 10 of the Laws, as a revival of the old idea of a city religion. The content of this new Civic Religion, however, would be remodeled in accordance with Plato's own theological conceptions. Solmsen calls this attitude both archaic and Hellenistic. As to the Hellenistic element, the author points to the influence of the mystery cults and of Persian religion, the latter revealing itself most clearly in Plato's conception of the two antagonistic World-Souls. He also discusses at length such issues as Plato's ideas of a divine justice, his tendency towards monotheism, and the influence of his theology on later Greek philosophy and on Christian thought, especially Origen.