What is the meaning behind the metaphor of the Ganges River at the beginning of Chapter 47?

In Chapter 47, the metaphor of the River Bhagirathi, or Ganges, is used to highlight the supreme purifying power of saints like Sai Baba. The chapter poetically describes that the Ganges, while washing the sins of the world, becomes soiled herself. To cleanse these accumulated impurities, she "desires the dust from the feet of saints." The river is depicted as longing for saints to bathe within her, knowing that "without this, there is no deliverance from her sins." This powerful imagery, as presented in Chapter 47, establishes that the spiritual power of a true saint is so immense that even a sacred entity like the Ganges, a purifier for millions, seeks purification from them, thus elevating Sai Baba's divine stature.