Can you explain the analogy of the River Ganges from Chapter 47 and how it illustrates the power of saints like Sai Baba?

Chapter 47 uses a powerful analogy involving the River Ganges to illustrate the purifying power of saints. It describes how the Ganges, which washes away the sins of the world, becomes soiled herself with those accumulated impurities. To become pure again, the river desires the dust from the feet of saints, knowing there is no other way for her deliverance. This highlights the supreme status of saints. The chapter then calls Sai Baba the "crown jewel among such saints," whose merciful glance alone can liberate a devotee from the bonds of Karma and whose grace makes worldly existence lose its luster, signifying an even more direct and potent spiritual power.