What is the philosophical definition of 'death' provided in Chapter 37, and what are the spiritual obstacles it identifies as the true 'nooses of death'?

Chapter 37 explains that what we call 'death' is simply the process of a manifested form returning to its unmanifest state. It is not an end but a transition. The true 'nooses of death' are not physical but spiritual: Adharma (unrighteousness), ignorance, anger, and hatred. The text clarifies that a person who can entirely cross over these negative forces is the one who truly enters the heavenly world, which is described as a state of being free from mental grief and fear, a realization of the Cosmic Self-form.