We start with what is written by Chazal, that "there are five names given to the Nefesh," and the order of them from lowest to highest is: Nefesh, Ruach, Neshama, Chaya, and Yechida. Know, that a person (Adam) itself, he is the spirituality that is inside a body; and the body is a garment (Lavush) for the person, but it [the body] is not the person itself. As it says, "the flesh does not cover up the person," just as the Zohar says in Parshat Bereishit, Page 20:2.
As it is known, that the person is the source of all four worlds - ABiYah (Atzilus, Beriah, Yetzirah, Asiyah), and it is obvious that there are parts of each world within him, and these parts are what we referred to above (from one of the five names of the souls - Nefesh, Ruach, Neshama, Chaya, Yechida ("NaRaNChaY") as we described). But we do not merit to take them all in one moment; rather, we earn them through our merits.
First, we take the coarsest part which is called Nefesh. Afterward, if we merit further, we take the Ruach. And, just as it is described in multiple places in the Sefer haZohar, Parshat Vayechi and Parshat Terumah, and specifically, at the beginning of Parshat Mishpatim, Page 94:2, "When a person is born, he is given a Nefesh." And after we explain this, I need to let you know more of what is said above.