The psyche, as a reflection of the world and man, is a thing of such infinite complexity that it can be observed and studied from a great many sides.
It faces us with the same problem that the world does: because a systematic study of the world is beyond our powers, we have to content ourselves with mere rules of thumb and with aspects that particularly interest us.
Everyone makes for himself his own segment of world and constructs his own private system, often with air-tight compartments, so that after a time it seems to him that he has grasped the meaning and structure of the whole.
But the finite will never be able to grasp the infinite.
Although the world of psychic phenomena is only a part of the world as a whole, it may seem easier to grasp precisely for that reason.
But one would be forgetting that the psyche is the only phenomenon that is given to us immediately and, therefore, is the sine qua non of all experience. ~Carl Jung, CW 8, Para 283