Based on the provided text, what is the cause of the continuous cycle of birth and death (Samsara), and how does it relate to the concept of Parabrahman?

The text from Chapter 37 explains that the cycle of worldly existence, or Samsara, is perpetuated by a deluded perception of separation from the ultimate reality, Parabrahman. The same divine principle pervades all of creation, from the creator Brahma down to a blade of grass. However, a soul clouded by ignorance develops the notion that "Parabrahman is different from me; I am not that." The scripture states that anyone who holds this knowledge of difference is always subject to death, which is followed by birth, which is followed by death, trapping them in an eternal cycle.