Chapter 47 uses an analogy involving the River Ganges. What is this analogy and what does it teach about the holiness of saints?

In Chapter 47, an insightful analogy is presented to illustrate the supreme purity of saints. The text explains that the River Bhagirathi, or Ganges, becomes soiled by washing away the sins of the world. To cleanse herself of these accumulated impurities, the holy river herself desires the dust from the feet of saints. The river is depicted as longing for the day when saints will come to bathe in her waters, knowing that this is the only way for her to be delivered from her own burden of sins. This powerful comparison, as detailed in Chapter 47, elevates saints like Sai Baba to a position of ultimate purity, suggesting their spiritual power is so immense that even a purifying entity like the Ganges seeks their grace for its own salvation.