Can you explain the analogy of the River Ganges used in Chapter 47 to describe the greatness of saints?

Chapter 47 employs a powerful analogy using the River Bhagirathi, or Ganges, to illustrate the supreme purity of saints like Sai Baba. The text explains that the Ganges, revered for washing away the sins of the world, becomes soiled herself from this act of purification. To cleanse herself of these accumulated impurities, the river longs for the touch of a saint's feet. As Chapter 47 poetically describes, the Ganges wonders, "When will the feet of saints touch me? When will they come to bathe within me?" This metaphor powerfully conveys that the purifying power of a true saint is so immense that even the holiest of rivers, a purifier in its own right, seeks their presence for its own deliverance, thus elevating the status of the Guru above all.