Why does the beginning of the chapter talk about a holy river wanting the dust from a saint's feet?

Chapter 47 opens with a powerful allegory to establish the supreme spiritual status of saints like Sai. It describes a holy river that, despite its own purity, desires the dust from the feet of saints to "wash away her accumulated impurities." The river knows that without this contact, there is no deliverance from her sins. This illustrates a profound spiritual hierarchy where the purifying power of a true saint is so immense that even sacred entities seek it for their own salvation. By immediately referring to Sai as the "crown jewel among such saints," the text uses this story to emphasize Sai's unparalleled greatness and the extraordinary grace that flows from him.