Thus this volume dedicated to Nanã and Obá addresses, in the initial chapters, themes that make up the universe of the mythologist (how a mythology is born, mythological truth, about Yoruba mythology - how to identify its energy and specifically about the psychoanalytical concepts worked on in this volume: Desire, Lack and Mourning), if these are already properly understood there is no problem in skipping them going directly to the subsequent chapter, but as Socrates wanted when asked about what he did all day in the Agora: "Always the same about the same!" This, fundamentally, means that the more one discusses or reads about a topic the clearer and more precise it gets.