According to Chapter 11, what methods did Sai Baba use to help his devotees progress from worshipping his physical form to understanding the formless reality?

Chapter 11 details the various means Sai Baba employed to help his devotees realize the Nirguna, or formless reality. According to the text, he would tailor his methods to their eligibility. For instance, Baba would send some devotees to other countries, confine others to solitude in Shirdi, lock some in the Wada, or assign them the task of reading scriptures. The chapter explains that by practicing these disciplines for years, the devotees' longing for the Nirguna would grow, and their minds would become constantly occupied with Baba's company, whether sitting, sleeping, or eating.