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

Chapter 50 of the Shri Sai Satcharitra explains that any comparison of Sai Baba to celestial bodies like the sun and moon falls short of capturing his true nature. The author, Hemadpant, reasons that it is not fitting to compare Sai to the sun because the sun eventually sets, implying a period of absence or darkness. Similarly, a comparison to the moon is also dismissed because the moon wanes and is not always full. In contrast, the chapter emphasizes that 'Sai is forever complete.' This highlights Sai's eternal, unchanging, and ever-present nature, which transcends the cyclical and transient qualities of even the most powerful objects in the natural world, as detailed in Chapter 50.