The course will focus on the development of Freudian speculation: from studies on hysteria to reflection on society and on the religion of the last Freud. The course will deepen the Freudian methodology and the revolutionary discovery of the unconscious, themed The interpretation of dreams (1899). The new definition of psyche will be described (first topical: CONSCIO, PRECONSCIO, UNCONSCIOUS) and the structural model of the psyche: ES, IO and SUPER-IO. The scope and limits of the theory of child sexuality will be evaluated. With the discovery of Thanatos (Beyond the pleasure principle, 1920), the revision of the monistic theory of the psyche will be accounted for.