Originally Posted by
idiot
Jung formed a lot of his ideas about the functions from the people who he did therapy for. I believe this because of the constant references to mental disorders related to types:
"For this oblivion the object sooner or later takes revenge in the form of hypochondriacal, compulsive ideas, phobias, and every imaginable kind of absurd bodily sensation." - Jung on the extraverted intuitive type
"Hysteria is, in my view, by far the most frequent neurosis with the extraverted type"
"Hysteria, with the characteristic infantile sexuality of its unconscious world of ideas, is the principal form of neurosis with this type." - Jung on the extraverted feeling type
The list goes on.
If he based his theories on the people he met in his life, even if he met more people than the average person, that means that he based his theories on a certain type of person.