Acharya Prashant explains verse 2.15 of the Bhagavad Gita, which states that the foremost among men, who remains calm in both pain and pleasure, surely attains immortality. He elaborates that this verse contains fundamental spiritual principles. The first principle concerns the experiencer. Pain and pleasure are external events that do not automatically translate into suffering and happiness. This translation occurs through the intermediation of the experiencer, which is the ego. The ego is described as an incomplete idea of itself, a thought, a belief, or a superstition that constantly seeks completion from the external world. Consequently, the world holds immense meaning for the ego, making it susceptible to happiness and sorrow based on worldly events. The second principle is about the nature of death and immortality. The speaker clarifies that it is the ego that dies, not the body. The body is part of Prakriti (nature), and its changes are random events. Pain and pleasure are also random events in Prakriti. Suffering, however, requires a sufferer, which is the ego. The ego is the one that gives meaning to pain, turning it into suffering. Similarly, the ego turns pleasure into happiness. The more meaning the world holds for a person, the more they are operating from the ego-center and are thus susceptible to the dualities of happiness and sorrow. Acharya Prashant equates equanimity with immortality. Immortality is not about the physical body living forever, but about the absence of the one to whom death is a reality—the ego. The ego is the 'death center'. To be immortal is to operate from the 'non-death center,' the Self (Atma), which is a state of being unperturbed by external events. This is achieved by not giving meaning to the random occurrences of pain and pleasure. Immortality is a state of being so content within oneself that one is not shaken by the world. It is a forgetfulness of the need to be afraid, a state where one is so busy in one's inner bliss that one forgets to die. This is the true meaning of being immortal.