According to Chapter 50, what is the true nature of Sai Baba, and why is it difficult to compare him to worldly things like the sun or moon?

Chapter 50 of the Shri Sai Satcharitra describes Sai Baba as a being of pure consciousness, the Unmanifest who has taken a tangible form for the sake of his devotees. The author emphasizes that his desireless state is beyond description. The chapter attempts to use metaphors, comparing Sai to the sun and the moon, but ultimately finds them lacking. As explained in Chapter 50, it is not fitting to compare Sai to the sun because the sun eventually sets, nor to the moon because the moon wanes. In contrast, Sai is described as being 'forever complete,' signifying his eternal, unchanging, and perfect nature which transcends the limitations of all worldly objects and phenomena.