Authors:

There is no such thing as a pure extrovert or a pure introvert. Such a man would be in the lunatic asylum.

Richard Isadore Evans, Carl Gustav Jung, Ernest Jones (1964). “Conversations with Carl [Gustav] Jung and reactions from Ernest Jones”, Princeton, N.J., Van Nostrand
There is no such thing as a pure extrovert or a pure introvert. Such a man would be in the lunatic asylum.