Based on the provided text from Chapter 42, what is the overall purpose and main subject of this chapter?

The primary purpose of Chapter 42 is to narrate the significant and solemn event of Sai Baba leaving his physical body. The chapter begins by reinforcing the power of the Guru's grace, stating that devotion removes worldly fears and opens the door to liberation. It then explicitly declares its intent, as noted in Chapter 42, to "describe Sai's nature" and provide a detailed "account of Baba's leaving his body." The remainder of the provided text focuses on the precise timing of this event, documenting the year, month, day, and specific lunar timings (tithis) to give a full and respectful account of Sainath's Mahasamadhi for the benefit of his devotees.