Acharya Prashant explains that the Bhagavad Gita and Vedanta primarily address the nature of the ego, which he defines as an incomplete entity that constructs and interprets experiences in its own image. He clarifies that while pain and pleasure are random occurrences in nature, they only translate into suffering and happiness through the intermediation of the ego. The ego, being fundamentally hollow and insecure, seeks completion from the external world, making it susceptible to worldly conditions. Realization does not eliminate physical pain, but it changes one's relationship with it, preventing it from becoming suffering. He further explores the equation between equanimity and immortality, asserting that immortality is not the extension of physical life but the absence of the ego center. Death is described as an imagination of the ego, which is the only entity that fears or experiences mortality. To be immortal is to operate from the true self, remaining indifferent and unshakable amidst the random events of life. Acharya Prashant emphasizes that spirituality is about stepping back from the world and finding inner sovereignty, rather than trying to save or interfere with nature. Ultimately, he describes the ego as a needless addition to an already complete inner state, and liberation as the removal of this 'tumor' to return to one's natural fullness.