Can you explain the metaphor of the River Ganges used at the beginning of Chapter 47?

The metaphor of the River Ganges, or Bhagirathi, is used in Chapter 47 to illustrate the supreme purifying power of saints like Shri Sai. The text explains that the Ganges, by washing the feet and sins of the world, becomes soiled herself with accumulated impurities. To cleanse herself of these sins, she yearns for contact with a true saint. As Chapter 47 poetically describes, the river desires the dust from the feet of saints, knowing that "without this, there is no deliverance from her sins." This powerful image establishes that the spiritual purity and power of a saint are so immense that they can purify even the most sacred and purifying entities in the world, thereby magnifying the divine stature of Shri Sai.