Yama and Nachiketa have a conversation about the nature of the soul in Which Upanishad

You may also wonder if Upanishad has conversation between Yama or Nachiketa.

Although the Katha Upanishad is the story, it was written in the 5th century BCE. However, the name has many earlier references. Yama, the god of Death taught him self-knowledge and the separation of the human soul (the supreme selves) from the body.

Why did Nachiketa feel so troubled? Uddalaka once made a sacrifice, in which he had to give up all of his possessions. Nachiketa lived at home. He saw that the cows being given to him were old and ineligible to give milk. His father's insensitive way of observing the sacrifice upset him.

Kathopanishad also asks what the nature of the soul is.

According to Nyaya philosophy, the nature of soul. According Nyaya philosophy the soul a real substantive being. It is distinguished by its qualities desire, aver­ sion, volition and pleasure as well as pain, cognition, and volition. It is the soul which confers unity on all types of apprehensions. It is permanent.

Yama is who?

Yama, the Hindu god of death and king of ancestors is the final judge on the fate of souls. He is also known by the names Pretaraja, the 'King Of Ghosts', Yama, the 'Restrainer' and Dharmaraja, the 'Kings of Justice'. Daksinasapati, is the South Quarter's regent.