What is the true definition of 'heaven' according to Sai's philosophy, and how does one attain it?

According to Chapter 37, the conventional idea of heaven as a place of sensual pleasure is not the ultimate goal. The true 'heavenly world' is described as the Vairaj, the Cosmic Being itself, or the Virat Self-form. This is a state of being, not a location, that is entirely free from mental grief, disease, worry, illness, sorrow, hunger, and thirst. In this divine state, there is no fear of old age or death, and the soul moves about completely fearless. One attains this state not through rituals or earning merit to go to a celestial realm, but by crossing the 'nooses of death'—which are adharma, ignorance, anger, and hatred—and realizing the divine principle that pervades all of creation.