According to the author in Chapter 50, why are comparisons of Sai to the sun and moon ultimately inadequate?

In Chapter 50, the author Hemad explains that comparing Sai to celestial bodies like the sun and moon falls short of capturing His true nature. He reasons that it is not fitting to compare Sai to the sun, because the sun, for all its glory, eventually sets each day. Likewise, a comparison to the moon is also inadequate because the moon wanes and is not always full. In contrast, the chapter states that Sai is "forever complete," implying a constant, unwavering, and perfect state that surpasses these natural analogies.