How does Chapter 47 use the analogy of the River Ganges?

In Chapter 47, an analogy is used to illustrate the purifying power of saints like Sai Baba. 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, she desires the dust from the feet of saints. As Chapter 47 puts it, the river wonders, "When will the feet of saints touch me?" because she knows there is no other way to gain deliverance from her own sins. This metaphor powerfully conveys the idea that the spiritual purity of a saint is so great that even sacred entities like the Ganges seek it for their own purification.