The guilty conscience is the price paid by the individual to belong to civilized society, but often this guilt is left unconscious and is experienced as anxiety or 'discontent'. Freud also considers that in addition to the individual super-ego, there may exist a 'cultural super-ego' that sets itself up as a conscience for society, and that his recommendation for it is the same as his recommendation for many of his neurotic patients: that it must lower its demands on the frail ego. Freud concludes this book by expanding on his distinction between eros and thanatos: "When an instinctual trend undergoes repression, its libidinal elements are turned into symptoms, and its aggressive components into a sense of guilt", and he ponders on how the eternal battle between these heavenly powers will play out in mankind.