Based on Chapter 50, why is Sai Baba considered beyond comparison to natural elements like the sun and moon?

Chapter 50 argues that Shri Sai is incomparable to celestial bodies due to his eternal and perfect nature. The author, Hemadpant, states that it is not fitting to compare Sai to the sun, because the sun inevitably sets. Similarly, a comparison to the moon is inadequate because the moon wanes and has phases of being incomplete. As the chapter concludes this point, it declares that 'Sai is forever complete.' This highlights Sai's nature as an unchanging, ever-present embodiment of pure consciousness, whose greatness transcends the limitations of the physical world.