How is Sai Baba compared to other saints and the philosopher's stone in the provided text?

The text in Chapter 4 draws several comparisons to highlight Sai Baba's greatness. He is likened to the great saint Ramdas, who moved from the Godavari to the Krishna river for the world's upliftment; similarly, Sai appeared on the Godavari for the same purpose. The text also draws a parallel between Sai's presence in Shirdi and other revered saints in their holy places, such as Damaji in Mangalwedha and Narasimha Saraswati in Wadi. More abstractly, saints are compared to the philosopher's stone, but their action is considered even more extraordinary because instead of just turning iron to gold, they bestow their own form of Self-realization upon their devotees.