Chapter 37 mentions 'nooses of death'. What are they, and what leads a person to be eternally trapped in the cycle of worldly existence?

The text of Chapter 37 identifies the 'nooses of death' not as a physical end, but as the spiritual hindrances of Adharma (unrighteousness), ignorance, anger, and hatred. He who can cross these enters the heavenly world. The chapter further elaborates on what keeps a soul bound to the cycle of worldly existence, or Samsara. It states that the belief that 'Parabrahman is different from me; I am not that' is the root cause. This knowledge of difference, or duality, ensures that the cycle of death following birth and rebirth following death continues eternally for that individual.