What were the primary spiritual texts emphasized by Sai Baba in Shirdi, and why were they considered so important?

The source material from Chapter 18 highlights two main books as being central to the spiritual life in Shirdi under Sai Baba's guidance: the Bhagavad Gita and the Bhagavat. Specifically, the texts mentioned for daily reading were Jnaneshwar's commentary on the Gita, known as Jnaneshwari or Bhavartha Deepika, and the beautiful eleventh Skandha of the Bhagavat—this is Nath’s platform for the highest spiritual goal. These books were considered divinely inspired and capable of granting salvation to those who read them with faith. The text describes the instruction in the Bhagavat as the loving speech of Nath. Baba's insistence on their daily reading by devotees like Bapusaheb Jog underscores their importance as a platform for attaining the highest spiritual goal and experiencing God's grace.