Carl Jung introduced the theory of personality types. You have used some of Jung's ideas if you think of yourself as introvert or extrovert; if you have ever used the Myers-Briggs personality or spirituality test.
Two ideas central to his theory: the ego and the self.
At university, Jung proved to be a brilliant student, graduating in medicine and natural science.
His doctorate was on "the psychology and pathology of so-called occult phenomena." Here he laid the foundations for two key ideas:
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