What is the root cause of being trapped in the cycle of birth and death, according to this text?

As detailed in Chapter 37, the primary cause of being trapped in the eternal cycle of worldly existence, or Samsara, is a deluded knowledge of difference. When a person believes, 'Parabrahman is different from me; I am not that, I am something else,' they create a sense of separation from the ultimate reality. The text states that he who has such knowledge is always subject to death. This perception of duality ensures that death follows birth and rebirth follows death, turning the wheel of Samsara eternally behind that individual.