How does Chapter 47 use the analogy of the River Ganges to illustrate the status of saints like Sai Baba?

In Chapter 47, the text presents a powerful analogy using the River Ganges (Bhagirathi). It explains that while the Ganges purifies the world by washing away people's sins, she herself becomes soiled with these accumulated impurities. The chapter poetically describes the river's deep desire for the dust from the feet of saints, knowing that this is the only way for her to be delivered from her own burden of sins. As Chapter 47 explains, this illustrates the supreme purifying power of saints. The narrative then calls Sai Baba the "crown jewel among such saints," implying his grace and the stories from his mouth possess an even greater power to purify listeners and sever their karmic bonds.