According to his own account in Chapter 19, what was the primary focus of Sai Baba's spiritual practice during his twelve years with his Guru?

Based on the narrative in Chapter 19, Sai Baba's primary spiritual practice was intense, one-pointed devotion and constant contemplation of his Guru. Although he initially sought a mantra, his true practice became gazing upon his master. He states, "I would gaze at my Guru's face with love day and night; I felt neither hunger nor thirst; without the Guru, my mind was restless." The chapter confirms this was the Guru's main expectation: "There was no meditation without him, no other goal; he was my only constant contemplation—the Guru’s wonder was marvelous." This unwavering focus, fueled by immense love and devotion, was the ultimate service and practice that the Guru nurtured in him over twelve years.