Explain the metaphor of the River Bhagirathi (Ganges) as used in Chapter 47 to illustrate the importance of saints.

Chapter 47 employs a poignant metaphor involving the River Bhagirathi, also known as the Ganges, to underscore the supreme purity of saints. The text explains that the river becomes soiled by washing away the sins of the world. To cleanse herself of these accumulated impurities, the river yearns for the "dust from the feet of saints." This imagery suggests that the holiness of saints like Sai is so immense that even a sacred entity like the Ganges seeks them out for its own purification. As Chapter 47 illustrates, this highlights that the grace of a true saint is the ultimate purifying force, superior even to the sacred river itself.