Ernest Jones schreibt an Frieda Gross: "[...] If you like you might say the Behandlung was still in progress and that I hat discovered all manner of complexes, the nature of which must remain a secret - in order to ensure success - until the results of Otto's treatment are decided. [...]"

Robinson, Ken: A Portrait of the Psychoanalyst as a Bohemian, in: Bachhiesl, Christian et al. (Eds.): Psychoanalyse & Kriminologie. Hans & Otto Gross. Libido und Macht. 8. Internationaler Otto Gross Kongress, Graz, 14. bis 16. Oktober 2011, S. 451