The gods were confused about the nature of ultimate reality. They realized that we ar ranhan, which is why yama is a teacher. The atman can't be truly comprehended or easily understood. It's very subtle tatspits cannot be easily understood. All these experiences are possible because pure consciousness atman bramhan thing. That's your real nature.
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.