The nature of Augustine's conversion, whether it was to Christianity or Neoplatonism, has been a matter of debate for a long time. Following the thread of the dialogue between divine word and human word, this article offers a new interpretation of the literal form and intellectual tendency of the Cassiciacum dialogues, with a view to demonstrating the continuity between the early works of Augustine and the Confessions, the masterpiece that marks the maturity of his religious thinking as well as his manner of writing. Based on this continuity, this article concludes that in Milan Augustine was converted to Christianity, not Neoplatonism.