Describe the purpose of this book and the role of a Sadguru as presented in Chapter 17.

Chapter 17 explains its own purpose and the function of a Sadguru. It describes the book, and specifically this chapter, as a metaphorical "boat" designed to help devotees cross the difficult "ocean of existence" and find refuge in Sai. The role of the Sadguru is central to this journey; one should listen to the stories from the Guru's mouth and follow his word with faith. The text from Chapter 17 also highlights a beautiful ripple effect: by seeing the positive conduct of those who follow this path, "others find the path of their own salvation; countless souls are saved easily through them."