According to Chapter 37, what is the fundamental reason a person remains trapped in the cycle of birth and death (Samsara)?

Chapter 37 posits that the root cause of being trapped in the cycle of worldly existence, or Samsara, is a deluded perception of separation from the ultimate reality. This delusion arises from ignorance, leading a person to think, "Parabrahman is different from me; I am not that, I am something else." The text states that anyone who possesses this knowledge of difference is always subject to death. This feeling of duality ensures that the cycle where death follows birth and rebirth follows death turns eternally behind that individual, keeping them bound to worldly existence.