What is the meaning of the analogy about the River Ganges in Chapter 47?

Chapter 47 uses a poignant analogy involving the River Ganges to illustrate the supreme purifying power of saints. The text explains that the Ganges, by washing the feet of the world, becomes soiled with impurities herself. To wash away these accumulated sins, she longs for the dust from the feet of saints. As described in Chapter 47, the river knows for certain that without the saints' feet touching her waters, there is no deliverance from her own impurities. This story highlights the holiness of saints like Sai, whose presence is so powerful that even a sacred entity like the Ganges seeks their grace for purification.