How did Sai Baba's focused contemplation on his Guru function as his primary spiritual practice?

In Chapter 19, Sai Baba describes how his intense devotion to his Guru became his all-consuming spiritual practice. He explains that he would "gaze at my Guru's face with love day and night," to the point where he felt neither hunger nor thirst. His mind was constantly restless when away from his Guru. Baba explicitly states, "There was no meditation without him, no other goal; he was my only constant contemplation—the Guru’s wonder was marvelous." This profound, loving focus was the only thing his Guru expected from him. In return for this unwavering devotion, which served as his meditation and goal, Baba received immense love, constant protection, and was raised from a child to an adult at his Guru's feet.