According to Chapter 37, what is the root cause of being trapped in the cycle of birth and death (Samsara)?

Chapter 37 explains that the root cause of being trapped in the cycle of worldly existence, or Samsara, is ignorance and the resulting sense of duality. The text states that the same divine principle, Parabrahman, pervades all of existence. However, a soul deluded by ignorance perceives itself as separate from this ultimate reality. As the chapter explicitly states, one who holds the belief, "Parabrahman is different from me; I am not that," is always subject to death. This 'knowledge of difference' is what perpetuates the cycle where death follows birth and rebirth follows death. Overcoming this delusion is the key to liberation.