How is Sai Baba's greatness described in comparison to other saints or concepts in the provided chapters?

Chapter 4 provides several powerful comparisons to illustrate Sai Baba's greatness. He is likened to the great saint Ramdas, who also left the banks of the Godavari for the world's upliftment, suggesting Sai's appearance serves a similar grand purpose. The text also compares saints to a philosopher's stone, which turns iron into gold, but notes that saints like Sai are even more extraordinary because they bestow their own form, or Self-realization, upon their devotees. Finally, his presence in Shirdi is equated with the significance of other great saints in their respective holy places, such as Damaji in Mangalwedha and Narasimha Saraswati in Wadi, solidifying his status among the great spiritual masters.