When does the River Ganges desire the dust from the feet of saints, and why?

In an analogy presented in Chapter 47, the River Ganges desires the dust from the feet of saints after it has become soiled itself. The text explains that the river washes the feet of the world, and in doing so, it accumulates impurities and sins. To purify herself from this accumulated pollution, the Ganges yearns for the moment when holy saints will touch her and bathe within her. The text states, "She knows for certain that without this, there is no deliverance from her sins." This illustrates the supreme purifying power of saints like Sai Baba, whose presence is sought even by the holy Ganges for its own salvation.