What is the root cause of the cycle of birth and death (Samsara) according to this text?

The text in Chapter 37 explains that the root cause of being trapped in the eternal cycle of worldly existence (Samsara) is a deluded sense of separation from the ultimate reality. This delusion, born from ignorance, manifests as the belief that 'Parabrahman is different from me; I am not that.' The scripture states that he who holds this knowledge of difference is always subject to death, which is followed by rebirth, turning the wheel of Samsara eternally. It emphasizes that the same divine principle pervades everything, and the appearance of difference is only due to ignorance and limiting adjuncts (upadhis).