What does Chapter 37 say is the root cause of being trapped in the cycle of rebirth?

The primary cause for being trapped in the cycle of worldly existence (Samsara), as detailed in Chapter 37, is the delusion of separateness from the ultimate reality. The text explains that a soul deluded by ignorance develops the conviction that "Parabrahman is different from me; I am not that, I am something else." It is this very knowledge of difference that subjects the individual to the eternal cycle where death follows birth and rebirth follows death. This cycle continues endlessly for one who fails to realize the non-dual truth that the same divine principle pervades everything, from the creator down to a blade of grass, a central philosophical point made in Chapter 37.