The City of God stands as Augustine's masterwork of theological defense and construction, written over thirteen years in response to accusations that Christianity brought ruin upon Rome. This first volume contains the first ten books of sustained refutation—demolishing pagan claims that traditional worship secured either temporal prosperity or eternal happiness—followed by the beginning of his positive vision in Books Eleven through Thirteen, where he traces the origin of two societal orders to the primordial division among the angels. What emerges is not merely an apology for Christianity but a philosophy of history that subordinate the fate of empires to the hidden providence of the one true God, whose sovereignty extends from creation through the fall to the final judgment.
Augustine opens the tenth book of The City of God by establishing the fundamental question that animates the entire discussion: to whom is that supreme worship due which leads to blessedness? He observes that while all rational beings desire happiness, philosophers have disputed endlessly about what constitutes true felicity and how it may be attained. Among the various schools, the Platonists merit particular attention because they perceived, with greater clarity than most, that the soul’s happiness depends entirely on participation in the unchangeable light of the one God who created all things. They understood that both angels and men must draw their blessedness from this same divine source. Yet Augustine identifies a fatal inconsistency: despite this profound theological insight, the Platonists accommodated themselves to popular error, permitting or even endorsing the worship of multiple deities and, in some instances, advocating sacrifice to demons. This contradiction raises the central inquiry of the book: what do the blessed and immortal spirits themselves desire regarding our worship? Do the holy angels, who love us and seek our eternal welfare, wish us to offer sacrifice to them, or do they direct us to adore the one God alone? The answer to this question determines the nature of true religion and reveals the way of salvation.
To address this question with precision, Augustine first establishes the terminology of worship. He explains that the Latin language lacks a single term that adequately expresses the supreme adoration owed exclusively to the Deity. The Greek word latria, as used in Scripture, designates that unique service rendered to God, which must be distinguished from douleia, the general service owed to human masters. Common Latin terms prove inadequate: cultus applies broadly to the honor paid to humans, the cultivation of fields, and even the inhabiting of cities. Religio similarly fails, for it describes social bonds and human relationships. Pietas extends to duties toward parents and works of charity. Augustine therefore adopts the Greek designation to mark out that worship which belongs to God alone—the service that makes its worshippers partakers of the divine nature. This definition carries immediate implications: if the holy angels truly love us and desire our happiness, they must direct us to the source of their own blessedness rather than to themselves. An angel who does not worship God would be wretched, deprived of the supreme good; an angel who does worship God cannot desire to receive in God’s stead the honor that belongs exclusively to Him.
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