Can you describe the methods Sai Baba used to help his devotees realize the formless (Nirguna), as mentioned in Chapter 11?

As detailed in Chapter 11, Sai Baba employed a variety of methods to guide his devotees toward the realization of the Nirguna, or the formless aspect of the divine. He would tailor his approach based on their individual eligibility. Some of the techniques mentioned include sending a devotee to another country, confining another to solitude within Shirdi, locking someone in the Wada (lodging), or assigning them the task of reading scriptures. He might even forbid his physical sight for extended periods. The purpose of these practices was to cultivate a deep longing for the Nirguna so that the devotee's mind would be constantly occupied with Baba's essence, regardless of his physical presence.