The teacher is none other than the Lord of death, Yama. The student is the brilliant and amazing young man, young boy, Nachiketa. He has told us the nature of the ultimate reality. What is the ultimate reality? Brahman. It has these two aspects, pure existence, consciousness, bliss which is our nature. We are unlimited being, unlimited limitless consciousness and limitless bliss. But that also is the god of this universe, the Saghuna Brahman and Ishwala.