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

Chapter 50 explicitly states that comparing Sai Baba to celestial bodies like the sun and moon is insufficient. The author, Hemadpant, reasons that it is not fitting to compare Sai to the sun because the sun eventually sets. Similarly, a comparison to the moon is also flawed because the moon wanes and is not always full. In stark contrast, the chapter emphasizes that "Sai is forever complete." This highlights the eternal, unwavering, and perfect nature of the Sadguru, which transcends the cyclical and imperfect qualities of even the most powerful objects in the physical universe, as described in this part of the Shri Sai Satcharitra.