It is continually seeking an image which has no existence in reality, but which it has seen in a kind of vision. It glides unheedingly over all objects that do not fit in with its aim. It strives after inner intensity
Jung’s foundational account establishes introverted feeling as a function directed not toward object-adaptation but toward inner archetypal images, generating a depth that manifests negatively and remains largely invisible to outside observers.
, Psychological Types, 1921thesis