What is Sai's fundamental advice for overcoming the fear of death?

According to the teachings in Chapter 37, death is described as the great fear of worldly existence. To become fearless, the primary advice is to hold firmly to the Guru’s pair of feet. The Guru will then grant a non-dual intellect, which is the key to liberation. By surrendering completely to the Satguru with one's body, speech, and mind, all worries about the world, including the fear of death, are removed because the Guru is the one who takes care of everything. This act of surrender eliminates the fear tied to worldly existence and the cycle of birth and death.