let us study how our lower self, the personality, was formed.
the origin of the personality is in the spirit : it is the spirit that emanated it.
in the beginning there was the spirit, and when the spirit wanted to manifest it self it fashioned vehicles adapted to regions of matter that are more and more dense in which the spirit descend. we will call these vehicles bodies and they are, from the subtlest to the thickest, atmic body, buddhic body, casual body, which correspond to the higher self, the individuality; then you have the mental body, the astral body and the physical body which correspond to the lower self, the personality. i know i wrote it before but its kind off important to know.
the physical body, the astral(body of feelings) and the mental body(body of thoughts) reproduce on a lower level the functions of the atmic, buddhic, and casual body.