According to the teachings in Chapter 27, what are the signs of a true devotee who is deeply engaged with Sai's stories, and what is the source of this experience?

Chapter 27 vividly describes the physical and emotional responses of a true devotee immersed in Sai's stories. It suggests that while listening to the pure story-nectar, a devotee should experience perspiration breaking out over their body, eyes filling with tears of love, and goosebumps rising repeatedly. The chapter mentions that the assembly of listeners might even experience weeping and sobbing. According to the text of Chapter 27, these profound reactions are not mere emotional outbursts but an awakening of the Guru's grace. This grace is beyond the reach of the senses and can only be attained through a Sadguru, as a giver of this experience cannot be found anywhere else.