What does Chapter 27 say about the relationship between a Guru's joy and a devotee's spiritual progress?

Chapter 27 of the Sai Satcharitra sheds light on the reciprocal nature of the Guru-devotee relationship, particularly concerning joy and spiritual growth. The text explains that the Guru finds supreme joy in whatever constitutes the devotee's own happiness. Furthermore, as the devotee turns more towards the spiritual path, the Guru feels an increasing sense of wonder and delight. This suggests that the Guru's happiness is intrinsically linked to the devotee's progress and well-being. This concept is contrasted with the vain attachments to "I" and "mine" (like body and home), which are described as momentary Maya. The true path to please the Guru and achieve lasting happiness, as detailed in Chapter 27, is through singular devotion and spiritual advancement.