What causes a soul to be trapped in the endless cycle of birth and death?

Chapter 37 explains that the root cause of being trapped in the cycle of worldly existence, or Samsara, is a fundamental misunderstanding of one's own nature. This cycle, where death follows birth and rebirth follows death, turns eternally behind a person who possesses the "knowledge of difference." This is the deluded belief that "Parabrahman is different from me; I am not that, I am something else." Holding this perception of separation from the ultimate reality (Brahman) is what subjects a soul to the continuous and repetitive cycle of death and rebirth.