Based on Chapter 37, what is the cause of the cycle of worldly existence (Samsara) and how is it related to Parabrahman?

Chapter 37 explains that the same divine principle, Brahman, pervades all of creation, from the creator down to a blade of grass. However, a soul deluded by ignorance may perceive a difference, thinking, 'Parabrahman is different from me; I am not that.' As the chapter clarifies, anyone who holds this knowledge of difference is always subject to death. This delusion is what perpetuates the eternal cycle of worldly existence (Samsara), where death follows birth and rebirth follows death, turning endlessly behind the individual.