Carl Gustav Jung, Collected Papers on Analytical Psychology… (1916)
“ Resistance always springs from a peculiar sexual development. The latter leads in the well-known manner to conflict, i.e. to the complex. Every case of schizophrenia which has so far been analysed confirms this. It can therefore claim at least to be a working hypothesis, and one to be followed up. In the present state of our knowledge, it is therefore not easy to see why Bleuler only allows to sexuality a quasi-determining influence on the phenomena of negativism; for psychoanalysis demonstrates that the cause of negativism is resistance ”
