From a spiritual perspective, what was the significance of the Nath Bhagawat and Jnaneshwari in Shirdi?

According to Chapter 18, the Nath Bhagawat, containing the Uddhava Gita, and the Jnaneshwari, a commentary on the Gita, were central to the spiritual life in Shirdi. The Nath Bhagawat is described as a 'divinely inspired book' whose reading was ordered by Sai for the 'salvation of souls,' with its dialogue between Krishna and Uddhava considered exceptionally sweet. Both this text and the Jnaneshwari were made to be read daily by the merciful Sainath. Together, these scriptures were considered the 'platform for the highest spiritual goal' and the very essence of the Bhagavat religion as practiced in Shirdi, offering a path to attain God instantly through faithful reading.