In what ways did Sai Baba guide his devotees from attachment to his physical form towards an understanding of his formless nature, as mentioned in Chapter 11?

As detailed in Chapter 11, Sai Baba employed countless methods to help his devotees transition from attachment to his Saguna (manifest) form to an understanding of his Nirguna (formless) nature. The chapter mentions that he would tailor his approach based on a devotee's eligibility. For instance, he would send one devotee to another country, confine another to solitude within Shirdi, lock a third in the Wada, or assign someone the task of reading scriptures. By practicing these disciplines over many years, the devotees' longing for the formless would grow, and their minds would become constantly occupied with Baba’s company, regardless of his physical presence.