What is the relationship between a devotee's spiritual progress and the Guru's feelings as described in Chapter 27?

Chapter 27 beautifully illustrates the symbiotic relationship between a devotee and the Guru. It states that the Guru finds supreme joy in whatever constitutes the devotee's own happiness. More specifically, as the devotee turns more towards the spiritual path and makes progress, the Guru feels an increasing sense of wonder. This chapter suggests that the path to this spiritual progress and the emergence of supreme love and devotion can only be realized through ultimate faith in the Guru's feet, which in turn brings joy to the Guru.