Analyzing the works of René Descartes (1596-1650) and the conception of rhetoric as a meta language, provided both by Roland Barthes and by Haroldo de Campos, we investigated tension between Giambattista Vico (1668-1744) and the French philosopher. Misunderstanding forged from indirect reading of Neapolitan rector of the works of Descartes. This work analyzes the difference between the certification of knowledge in Descartes and Vico, a difference that, according elucidated, may be located in the tension between the concepts of truth and verisimilitude, respectively, as well as the concepts of way and sense. In 1699, Giambattista Vico took over the chair of Rhetoric at the Royal University of Naples. From this year by the year 1707, the philosopher gave opening speeches of school years at this institution. These talks come in under the heading of Orazioni Inaugurali (1699-1707), from which were analyzed in the present work the first two, pertaining to the years 1699 and 1700. This analysis sought to nuance not only the interweaving between form and content as, also, from there, suggest that the verisumilitude viquiana focuses formally in his writings, as well as the Cartesian truth would be derived from certain textual structure.