How did Sai Baba guide his devotees from the worship of his physical form (Saguna) to the understanding of the formless (Nirguna) as described in Chapter 11?

According to Chapter 11, Sai Baba employed numerous unique methods to help his devotees transition from focusing on his manifest form to realizing the unmanifest, or Nirguna. He would tailor his approach based on their spiritual eligibility. For instance, Baba might send a devotee to another country, confine another to solitude within Shirdi, or assign them the task of reading scriptures. The text 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 essence, leading them to understand the eternal beyond the perishable physical body.