This paper approaches Augustine's treatise On the City of God (De civitate Dei) as a pivotal work situated between classical political thought and Christian eschatology, arguing that its rich intertextual dimension—which can now be investigated through the uBIQUity platform—plays a crucial role in the development of an extremely original and influential utopian project. Rather than proposing an ascetic withdrawal from civic life, Augustine articulates a dialectical vision in which the earthly and the heavenly cities coexist in the temporal realm, compelling Christians to engage actively in the sociopolitical order while orienting their interior life toward an eschatological fulfilment. Through a close reading of Books 10, 19, and 22 and their intertextual matrix - as reflected in the outputs of uBIQUity - the present paper highlights Augustine's complex reception of Greco-Roman traditions (particularly Platonism, Stoicism, and Cicero's philosophica) and the ways in which biblical intertextuality reshapes classical models of community, justice, and moral progress. Augustine's idea of civitas Dei emerges as a transitional utopia: simultaneously present and incomplete, grounded in ancient culture and biblical revelation, yet projected toward the final consummation of history.