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

The beginning of Chapter 47 employs a powerful metaphor involving the Ganges River to illustrate the supreme purity and power of saints like Sai Baba. The text explains that the River Bhagirathi (Ganges), by washing the sins of the world, becomes soiled herself. To wash away her own accumulated impurities, she "desires the dust from the feet of saints." As described in Chapter 47, the holy river yearns for saints to bathe in her, knowing that "without this, there is no deliverance from her sins." This imagery powerfully conveys that the spiritual grace of a true saint is considered even more purifying than the sacred waters of the Ganges.