The doctrine of the not-self is central to Buddhism. Aspects of such a teaching can also be found in Hegel. He even helps us to better understand how healing aspects of the not-self teaching unfold in everyday life and in psychotherapy.
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In my dissertation you will find a detailed discussion of the Buddhist non-ego in chapter 10:
https://www.academia.edu/63732680/Early_Buddhism_and_its_Relation_to_Brahmanism_A_Comparative_and_Doctrinal_Investigation
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