Provide a summary of the main teachings presented in Chapter 33 of the Shri Sai Satcharita.

Chapter 33 of the Shri Sai Satcharita primarily focuses on the glory and significance of Udi (sacred ash). The chapter begins by praising saints and then describes Baba's practice of maintaining a constantly burning Dhuni with firewood he procured. From this fire, he would collect the Udi and distribute it to devotees, especially as a sign of permission when they were leaving Shirdi. The core teaching of the chapter, as explained by the author, is the symbolism behind the Udi. It represents the transient nature of the physical body and the entire visible universe, reminding us that everything eventually turns to ash. Baba gave this Vibhuti to instill the awareness that Brahman alone is real, while the cosmos is an illusion (Maya), a profound truth devotees were to remember day and night.