This article tries to show how VII Sermones ad Mortuos were for Jung a pivotal text, leading him to a radical self-transformation. By venturing to allow the unknown to occur, Jung permitted the emergence of an organizing principle and also the evolution within himself of what was to come: a man, an oeuvre, a therapeutic method. This turning point, representing an epistemological fracture, is a crucial moment in Jung's life: the letting go of a paternal imago which imprisoned him, paved the way for a decisive transition to the symbolic function.