The prevalent popularity of the term 'sense of inferiority' leads S. Freud to explain that the conception finds little or no place as such in psycho-analytical theory, and that it is ultimately found to be almost synonymous with the sense of guilt. Internal mental conflict, Freud's momentous discovery, is based, as he has explained, on this very interaction of libido and aggression within the organism. Freud's caution has often proved valuable; he does not give more than he has, and he has always been ready to leave many openings for other workers to pursue. The development of the woman's personality—in particular the early antecedents of its complicated structure, which involve transitions in both her sexual organ and her love-object—have for some time been a disputed matter among certain analysts, and Freud comes down authoritatively on one side in the debate.