What comparisons does the author use in Chapter 50 to illustrate Sai Baba's eternal and perfect nature?

In Chapter 50, the author, Hemad, contemplates how to describe Sai's greatness and concludes that conventional comparisons are inadequate. He explicitly states that it is not fit to compare Sai to the sun, because the sun eventually sets. Similarly, he finds it inappropriate to compare Sai to the moon, as the moon wanes and is not always full. The chapter uses these examples to emphasize that, unlike these celestial bodies with their cycles of change, Sai is 'forever complete' and eternally present, highlighting His supreme and unchanging nature.