C.G. Jung Letters, Vol. 1: 1906-1950
Dear Fraulein N., 23 May 1935
As it is at the moment essentially a question of consolidating your personality,
I would strongly advise you to do this bit of analysis with a woman, since experience has shown that analysis with a man always has an effect on the animus, which for its part loosens up the personality again, whereas analysis with a woman tends on the contrary to have a “precipitating” effect.
With best regards,
C.G. Jung ~Carl Jung, Letters Vol. I, Pages 190-191