According to Chapter 37, what belief keeps a person trapped in the cycle of birth and death?

Chapter 37 explains that the root cause of being trapped in the eternal cycle of worldly existence, or Samsara, is a deluded sense of separation from the divine. The text states that a person who holds the knowledge of difference, thinking 'Parabrahman is different from me; I am not that, I am something else,' is always subject to death. Chapter 37 clarifies that this perception of duality ensures that death follows birth and rebirth follows death in a continuous, turning cycle for that individual.