Look at the Sefer Habris who explains in great detail that in order to fight the Yetzer Horah we must have a hechere neshama. He is as great as the neshama can take. When he exhausts it as a tzadik a hechere neshomo is given to him otherwise he can not excel. There are twenty five levels of neshama נפש רוח נשמה חיה יחידה so you can have נפש שבנפש and רוח שבנפש etc. then נפש שברוח etc then נפש שבנשמה etc. similar to sefiras haamer.
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