The text mentions the River Bhagirathi (Ganges). What is the significance of this analogy in the context of saints?

Chapter 47 uses a powerful analogy involving the River Bhagirathi, also known as the Ganges, to illustrate the purifying power of saints. The text explains that the river, by washing the feet of the world, becomes soiled herself with accumulated impurities and sins. To cleanse herself, the river desires the dust from the feet of saints. As stated in the chapter, she knows there is no other way for her deliverance. This analogy highlights the supreme holiness of saints like Sai, suggesting their very presence is so pure that even a sacred river seeks them out for its own purification.