According to the teachings in Chapter 37, what is the primary cause of being subject to the cycle of birth and death?

The primary cause of being trapped in the eternal cycle of birth and death (Samsara) is the ignorance that creates a sense of separation from the ultimate reality, Parabrahman. As explained in Chapter 37, the same divine principle pervades everything, from the creator down to a blade of grass. However, when a soul is deluded by ignorance, this unified reality appears fragmented. The text states that one who holds the belief, "Parabrahman is different from me; I am not that, I am something else," is always subject to death. This knowledge of difference, or duality, ensures that the cycle of worldly existence continues eternally.