Based on Chapter 11, what methods did Sai Baba use to help his devotees progress spiritually from attachment to his physical form towards understanding the formless?

Chapter 11 explains that while devotion to Sai Baba's physical form was the starting point, he actively guided devotees toward realizing the Nirguna, or the formless, eternal reality. To achieve this, Baba employed various means tailored to the devotee's eligibility. The chapter mentions several specific methods he used to create a sense of separation and cultivate a deeper longing. These included sending a devotee to another country, confining another to solitude within Shirdi, locking someone in the Wada, or assigning them the task of reading scriptures. By practicing these disciplines, as described in Chapter 11, the devotee's mind would become constantly occupied with Baba's essence, moving beyond the physical and growing a longing for the beginningless and endless Eternal.