What are the central teachings presented in Chapter 27 of the Sai Satcharitra regarding the Guru-devotee relationship and spiritual realization?

The central teachings of Chapter 27 of the Sai Satcharitra revolve around the supreme importance of the Sadguru in a devotee's life. The chapter teaches that clinging to the Guru's feet is the ultimate act of devotion, equivalent to worshipping the highest deities and achieving the merit of all pilgrimages. It describes the ideal devotee's experience as one of deep emotional and physical response to the Guru's stories, which is a sign of grace. To overcome Maya, the text advises singular surrender to Sai. Ultimately, the chapter posits that the Guru finds joy in the devotee's spiritual progress and is the sole giver of grace that is beyond the reach of the senses.