Based on Sai Baba's own experience, what does a Guru truly expect from a disciple?

Sai Baba's account in Chapter 19 reveals that a Guru's expectations are primarily spiritual. While Baba served his Guru for twelve years, he emphasizes that the Guru never gave him a secret mantra. Instead, what the Guru expected was 'strong faith at the Guru’s feet and the strength of courage which is patience.' Baba’s own devotion was his offering; he would gaze at his Guru's face day and night, feeling neither hunger nor thirst, with his mind in constant contemplation of his master. The Guru, in turn, nurtured him with a loving gaze, much like a mother tortoise feeds her young from afar, providing protection and spiritual sustenance without the need for formal verbal instruction.