What methods did Sai Baba employ to help his devotees realize the formless (Nirguna) aspect of God, as described in Chapter 11?

According to Chapter 11, Sai Baba used various means to guide his devotees from devotion to his physical form towards the realization of the formless Nirguna. Based on a devotee's eligibility, he would employ different techniques to cultivate longing and detachment from the physical. These methods included sending a devotee to another country, confining someone to solitude in Shirdi, locking a person in the Wada, or assigning them the task of reading scriptures. The purpose of these practices, which could last for years, was to ensure the devotee's mind remained constantly occupied with Baba's essence, leading them to understand that the physical body is perishable while the spirit is eternal.