Acharya Prashant clarifies that after the death of the body, nothing remains, and this state of 'nothingness' is what is truly called peace. He explains that spirituality is for the living, not for the dead. People often worry about what will happen after death, but that worry itself is happening in the present moment. He emphasizes that one's primary concern should be their immediate life and the suffering they experience now, rather than speculating about future births or the afterlife.