Burghölzli, although he continued his laboratory work and university teaching. A document-based account of these events, including the three-way correspondence among Spielrein, Jung and Freud, appears in Launer's biography. After a hiatus of several months caused by the tension, Spielrein and Jung resumed their relationship in the summer of 1909, and continued seeing each other privately up through the last months of 1910. Spielrein permanently departed Zurich around January 1911. In Spielrein's private diary entry dated 11 September 1910—just four months before graduating from medical school, and leaving both Jung and Zürich—she mused again upon her fantasy of bearing Jung's son. Sabina saw in reality how totally impossible it was, how it would ruin her chance of finding another love and destroy her scientific and professional ambitions: With a baby I would be accepted nowhere. And that would be in the best of cases; what if I did not even get pregnant? Then our pure friendship would be destroyed by the intimate relationship, and our friendship is what is so terribly dear to me. This personal diary entry from late-1910 strongly suggests that Spielrein realized that even if they were to finally have sexual relations, she might not get pregnant. And having taken that step, “our pure friendship would be destroyed by the intimate relationship....” Written shortly before her departure from Zürich, those words seemingly imply that whatever the nature of their physical "poetry", Jung and Spielrein had not engaged in sexual intercourse. Some commentators have seen Jung's conduct as a professional boundary violation, while others have seen it as an unintended and forgivable consequence of early experimentation with psychoanalytic techniques. The historian and Freudian psychoanalyst Bruno Bettelheim commented on her treatment and the apparently beneficial result, noting that, "However questionable Jung's behaviour was from a moral point of view...somehow it met the prime obligation of the therapist towards his patient: to cure her”. By contrast, Peter Loewenberg (among others) has argued that it was in breach of professional ethics, and that it "jeopardized his position at the Burghölzli and led to his rupture with Bleuler and his departure from the University of Zurich". At the time, Freud was tolerant of what happened between Jung and Spielrein, and regarded it as an example of countertransference. Later, he confessed to Spielrein that it had played a part in the schism between him and Jung: "His behavior was too bad. My opinion