Anātman / Egolessness
This notion means that there is no really existing self. Buddhism holds that a so-called subject in the reincarnation does not exist at all. That is why it is called “egolessness.” This idea was originally directed against the thinking of the then-popular Brahmanism. This religion assumes that in the unpredictable and complex subjective experience there is a permanent and unchanging self. Whereas Buddhism holds that the so-called “I” is just an aggregate of many psychological and physical phenomena. The idea was later extended to areas beyond the subject in life, that is, people and other existence are all egoless. Namely nothing has an enduring and constant core essence or a real self.
All Buddhas fully comprehend that there is neither ego nor anything belonging to a self. That is why they can give up the faculty body and the faculty life. (Scriptural Text: Lotus of Compassion)