What analogy involving the River Ganges is used in Chapter 47 to describe the purifying power of saints?

Chapter 47 employs a poignant analogy with the River Bhagirathi (Ganges) to illustrate the supreme purifying power of saints like Sai Baba. The text explains that while the Ganges washes away the sins of the world, she becomes soiled by these impurities herself. To achieve her own purification, the river longs for the dust from the feet of saints. As Chapter 47 poetically phrases it, the Ganges wonders, "When will the feet of saints touch me? When will they come to bathe within me?" This illustrates that the spiritual purity of saints is so profound that even a sacred entity like the Ganges seeks their presence for its own deliverance from accumulated sins.