3. The matter of Nefesh, Ruach, Neshama, etc. and its rabbinic subdivisions are discussed at length in Gate Four of Sha’ar HaP’sukim on the verse “His mother would also make a little robe for him” (I Samuel 2:19). Also explained in Gate Five of the Gate of the Mitzvot, Va’ychi, in the laws of mourning. And we will also add more that is new.
Know that all of the "Nefashot" are from the world of Asiyah only, and all of the "Ruchot" are from the world of Yetzirah, and all of the "Neshamot" are from the world of Beriah. But, not all people (B'nei Adam) have all of the five parts [of the soul], which are called Nefesh, Ruach, and Neshama, etc. They only have a part of the Nefesh, which is from the world of Asiyah. However, even with this, there are many levels, because Asiyah itself is separated into five "Partzufim" which are called "Arich Anpin" (Yechida), and "Aba" (Chaya), and "Imma" (Neshama), and "Zeir" (Ruach), and "Nukveh" (Nefesh). If a person is worthy to merit and to reach [receive] his Ruach (which is from Yetzirah), he must be complete with all of the five Partzufim from Nefesh of Asiyah....