... regress to the infantile way and to find expression by means of phantasy. After long experience Freud concluded that phantasy lies at the root of every neurosis. Jung says that a sex-phantasy is always at least one determiner of a nervous illness, and Jelliffe writes that the essence of the neurosis is a special activity of ... — Outwitting Our Nerves - A Primer of Psychotherapy • Josephine A. Jackson and Helen M. Salisbury