Describe the specific sacred books that were read in Shirdi at Sai Baba's behest and why they were considered so important.

According to Chapter 18, the two main books that formed the core of the daily readings in Shirdi were the Bhagavad Gita and the Bhagavat. Specifically, the texts read were 'Jnaneshwari,' also called 'Bhavartha Deepika,' which is a commentary on the Gita, and the eleventh Skandha of the Bhagavat, known as 'Nath Bhagawat' or the 'Uddhava Gita.' These were considered divinely inspired books. The text highlights their power by stating that the instruction within the Uddhava Gita is superior to the dialogue between Krishna and Arjuna, and that those who read them with faith can attain God instantly, demonstrating why Baba placed such high value on their daily recitation.