How does Sai's philosophy redefine the concept of 'heaven', and why is life on Earth considered more valuable?

Chapter 37 presents a profound reinterpretation of heaven. It is not a physical place for sensual enjoyment but a state of being, described as the Vairaj or the Cosmic Self-form, which is free from mental grief, disease, sorrow, and the fear of death. This is the divine heavenly state where the soul is fearless. The text argues that the earth-world is of profound importance and better than a temporary heaven from which one falls after their merit is exhausted. As Chapter 37 explains, even a fleeting life on Earth is superior because a devotee who offers every action to God can attain a state of fearlessness, which is more valuable than celestial pleasures that lack the remembrance of the Lord.