Based on Chapter 11, what specific methods did Sai Baba use to guide devotees from attachment to his physical form towards realizing the formless eternal principle?

To help his devotees transition from Saguna devotion to Nirguna realization, Sai Baba employed various unique methods as described in Chapter 11. The text states that Baba would tailor his approach based on a devotee's eligibility. For instance, he would send some to other countries, confine others to solitude in Shirdi, lock one in the Wada, or assign them the task of reading scriptures. According to Chapter 11, the purpose of these practices, which could last for years, was to cultivate a deep longing for the Nirguna and make the mind constantly occupied with Baba's essence, thus helping them understand that the physical body is perishable while the spirit is eternal.