According to Chapter 50, why is it inadequate to compare Sai Baba to the sun or the moon?

Chapter 50 explains that comparing Sai Baba to celestial bodies like the sun and the moon falls short of capturing his true, eternal nature. The author, Hemadpant, argues that such comparisons are flawed because these natural phenomena have limitations that Sai does not. As stated in the chapter, it is "not fit to compare him to the sun, for that sun sets." Similarly, a comparison to the moon is also deemed insufficient because the moon "wanes." In contrast to these transient cycles of rising and setting, waxing and waning, Chapter 50 describes Sai as being "forever complete." This highlights Sai's nature as constant, perfect, and beyond the cyclical limitations of the physical world, portraying him as an eternal and unchanging embodiment of consciousness.