What methods did Sai Baba use to guide his devotees from attachment to the physical form towards understanding the formless, as described in Chapter 11?

Chapter 11 details several methods Sai Baba employed to help his devotees transition from focusing on the Saguna (manifest) to realizing the Nirguna (unmanifest). He used countless means tailored to each devotee's eligibility. For example, the chapter mentions that Baba would sometimes forbid devotees from seeing him for long periods, send them to other countries, or confine them to solitude in Shirdi. Other times, he would lock someone in the Wada or assign them the task of reading scriptures. According to Chapter 11, by practicing these disciplines, the devotee's longing for the formless would grow, and their mind would remain occupied with Baba's company.