What does Chapter 37 reveal about the cause of the cycle of birth and death (Samsara)?

Chapter 37 explains that the perpetual cycle of worldly existence, known as Samsara, is driven by a fundamental delusion of separateness. The text states that when a person holds the knowledge of difference, thinking, "Parabrahman is different from me; I am not that," they become eternally subject to death. As described in Chapter 37, this mistaken belief ensures that death follows birth and rebirth follows death, trapping the soul in this continuous cycle. The root cause is therefore the ignorance that creates a distinction between the individual self and the ultimate reality, Brahman.