Describe the philosophical definitions of 'death' and 'heaven' presented in Chapter 37.

According to Chapter 37, death is not merely a biological end but the process where a 'manifest' state, which came from the unmanifest, enters the unmanifest again. The true 'nooses of death' are identified as adharma (unrighteousness), ignorance, anger, and hatred. Heaven, in turn, is not a physical place but the Vairaj (the Cosmic Being) itself. It is a state of being, the Virat (Cosmic) Self-form, which is free from mental grief, disease, worry, hunger, thirst, and the fear of old age. In this divine heavenly state, the soul moves about completely fearless without the duality of 'do's and don'ts'.