“The Interpretation of Dreams” is, according to Freud himself, his most important work, the product of a great inspiration, one of those that “only come once in the lives of mortals.” “The Interpretation of Dreams” is neither a fortune-telling book nor a dream interpreter. It is the Royal Road that leads directly to the unconscious, to the darkest area of the soul, filled with unmet passions and repressed desires. This very dark area, Freud set as his life's purpose to explore. Thus, “The Interpretation of Dreams,” the key to entering the unconscious, encompasses in many ways the entire subsequent structure of psychoanalysis and becomes a precursor of a series of significant works that belong more or less to the same temporal and thematic period.