Atzmus or Atzmut (עצמות from the Hebrew עצם etzem) is the descriptive term referred to in Kabbalah, and explored in Hasidic thought, for the divine essence.
Reference to atzmus is usually restricted in Kabbalistic theory to discussion whether "Ein Sof" represents the ultimate divine being in itself, or to God as first cause of creation.
Kabbalah, influenced by the philosophical argument, but seeking the Biblical God who is also immanent, gives a different, more radical solution.
Only through the 10 Sephirot Divine attributes is God revealed to Creation, and the sustaining lifeforce that continuously recreates existence is channeled.
Subsequently, the sephirot reconfigure as Partzufim, recasting Cordovero's linear hierarchy with one of enclothement, allowing lower Creation to conceal within it higher Divine origins.