What is the fundamental cause of being trapped in the cycle of birth and death (Samsara)?

According to the insights in Chapter 37, the root cause of being trapped in the eternal cycle of worldly existence (Samsara) is a specific kind of ignorance rooted in the perception of difference. This occurs when a soul, deluded by ignorance, believes, "Parabrahman is different from me; I am not that, I am something else." The text states that anyone who holds this knowledge of difference, or duality, is always subject to death. This perception of separation from the ultimate reality (Brahman) is what perpetuates the cycle where death follows birth and rebirth follows death.