There is no doubt that if Jung had remained close to his original clinical interests, he himself would have elaborated and enriched his early concepts of introversion and extraversion as well as many others. However, in his increasing preoccupation with mysticism Jung appears to have gradually moved further and further away from the empirical roots of his concepts.

It is most appropriate, therefore, before concluding these remarks to remind ourselves of Jung's important role in the development of psychoanalysis. Undeniably Jung was one of the major pioneers and collaborators of Freud, and his contributions to psychoanalysis have left their historical imprint. It would go beyond the scope of this essay to hark back to the years of Jung's enthusiastic collaboration with Freud, except to note that for many years he was a source of inspiration to his co-workers at Burghölzli.