What are the signs of the 'awakening of the Guru's grace' described in Chapter 27, and why is the Sadguru essential to experience this?

Chapter 27 describes the 'awakening of the Guru's grace' as a deeply moving, internal experience that manifests in tangible ways. The signs include perspiration breaking out over the body, eyes filling with tears of love, goosebumps rising repeatedly, and even weeping among listeners of the Guru's stories. This awakening destroys mutual conflicts and erases distinctions of small and great. The chapter stresses that this grace is beyond the reach of the senses and cannot be shown to the eyes. Therefore, the Sadguru is absolutely essential, as the text asserts that a giver of this profound experience 'cannot be found even by searching the three worlds' without the Sadguru's presence and guidance.