"While the controversy between Freud and Jung concerned theoretical matters, the exchange could not have been more personal; Anna Freud later remembered that the summer of 1913, just before their final break, was the only time she could remember her father depressed."
Freud's Requiem: Mourning, Memory, and the Invisible History of a Summer Walk - Matthew Von Unwerth

Matthew Von Unwerth, Freud's Requiem