The Myers-Briggs test is directly based off of Jung's book "Personalty Types", but you are right it was not created by Jung. It is merely Jungian.
In this work however, Jung does assert that there is a reliably constant "persona" and "ego" that exists at the conscious level. These raise up out of your unconscious and are somewhat hereditary (though not genetic). Basically, we all have certain roles we that we put on (such as father, son, professor, student, etc) and these roles are for society but beneath that we all have this concept of "this is really who I am". That remains pretty constant after childhood. Anyway, we need that persona & ego to keep all of the things we think and do that we consider not me out of our personality (like when we act a way or say something that is out of character). Anyway, the point is that since our personality and who we present to the world solely derives from within us it is therefore only how we perceive ourselves that matters.
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"The courts that first rode the warhorse of virtual representation into battle on the res judicata front invested their steed with near-magical properties." ~27 F.3d 751
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