Why does the book only compare Sai to the sun and moon instead of other major saints? It seems like a weak comparison.

Chapter 50 deliberately uses the comparison to the sun and moon to make a specific point about Sai Baba's eternal nature. The text states, 'It is not fit to compare him to the sun, for that sun sets. If I compare him to the moon, it wanes; Sai is forever complete.' This highlights His permanence and perfection. As Chapter 50 further explains, the book's goal is not a comparative analysis but to foster 'non-dual devotion' where the reader, the act of reading, and the subject are seen as one. This inward focus on attaining a 'natural state' (Sahaj-sthiti) is considered the supreme attainment, taking precedence over external comparisons to other figures.