Using a poststructuralist model, this article explores the lecture given by Ferenczi and published under the title “Confusion of Tongues between Adults and the Child—(The Language of Tenderness and Passion).” By initially focusing on the closed structure of the text, the author identifies two types of confusion of tongues that are closely interlinked: the confusion between adults and the child, and that between the analyst and the analysand. By then placing the manuscript within the corpus of Ferenczi, he connects it to the latter’s multilingualism and pleads in favour of autobiographical determinants for psychoanalytic conceptualizations. This positioning of the text in its historical framework also enables it to be situated in the context of the metapsychological confusion of tongues between Freud and Ferenczi, and to delimit the influence of Ferenczi’s ideas in psychoanalytic posterity.