What unique qualities of Sai Baba are highlighted in Chapter 50, and why is he considered beyond comparison?

According to Chapter 50, Sai Baba is described as "purely an embodiment of consciousness; the Unmanifest itself has taken form." This chapter emphasizes his compassionate nature towards faithful devotees, for whom he lovingly speaks his own life-story. His greatness is considered superior to celestial bodies. For instance, the text notes it is unfit to compare him to the sun, because the sun sets, whereas Sai's light is constant. Similarly, he is superior to the moon, which wanes, while "Sai is forever complete." This illustrates that, as Chapter 50 conveys, Sai's essence is eternal, complete, and beyond the limitations of the physical world.