What is Samadhi?  What is Nir-Vi-Kalpa Samadhi?  Is it only possible for a few who become famous in History? Or is it possible for everyone?  Is it temporary or permanent?  Is it dissolution of Ego Principle associated with final exit and no return, e.g, death or Maha Samadhi?  Or they are two different events? Can only few people survive and return? Does it lead to Brahma Gyani?  Why words like NirBeeja and Sahaja are added before NirVikalpa Samadhi?  Is this the domain of Avtaaras and Siddhas only?  Why does Gita talk about Meditation?  Why does Yoga Sutra offer the goal of Yoga as the "Cessation of the Mind Stuff."  Why it is listed as a last stage of the Yoga?  Does it mean it is the last stage of a Yoga Session or one's life?