"What you're talking about is subtler than an atom. That means no instrument can reveal it," he says. "You can't reach a firm conclusion about the artman by arguing about it." He adds: 'Without this kind of a teacher, without the help of the openitiats, otherwise it's impossible'
Swami Sarvapriyananda teaches the Katha Upanishad, which is one of the most popular Upanishads. The scripture concerns the story of a young man who goes to the house of death to find out what happens after death. The reply describes the nature of reality and the meaning of life.