Can you explain the analogy of the River Ganges used in Chapter 47 to illustrate the purifying power of saints like Sai Baba?

The analogy of the River Ganges in Chapter 47 is used to powerfully illustrate the supreme purifying power of saints. The text explains that the holy River Bhagirathi (Ganges), despite washing the feet of the world, becomes soiled herself from the accumulated sins she absolves. To wash away these impurities, the river herself desires the dust from the feet of saints. This metaphor, found in the opening verses of Chapter 47, establishes that saints like Sai Baba possess a holiness so profound that even a divine entity like the Ganges seeks their presence for its own purification.