How did Sai Baba show his devotion to his own Guru?

Sai Baba exemplified profound devotion through his actions and inner state while serving his Guru for twelve years. As he recounts in Chapter 19, his dedication was all-consuming. He would 'gaze at my Guru's face with love day and night,' to the point where he 'felt neither hunger nor thirst.' His focus was so complete that his mind was restless without his Guru, who was his 'only constant contemplation.' This intense, loving focus was all that his Guru expected from him. In return for this pure devotion, his Guru, described as a 'veritable idol of devotion and love,' provided for all his needs and always protected him in times of trouble.