“[Freud] said once to Marie Bonaparte: 'The great question that has never been answered, and which I have not yet been able to answer, despite my thirty years of research into the feminine soul, is "What does a woman want?”
― Sigmund Freud: Life and Work (Hogarth Press, 1953) by Ernest Jones, Vol. 2, Pt. 3, Ch. 16, p. 421. In a footnote Jones gives the original German, "Was will das Weib?"