Based on the invocations in Chapter 1, how is Sai Baba's role as a Sadguru described?

Chapter 1 powerfully defines Sai Baba's role as the Sadguru using the metaphor of a boatman guiding passengers across a river. After offering salutations to the trinity of Brahma, Vishnu, and Shankar, the author addresses Sai directly, stating, 'You alone are our Sadguru, the boat for the river of worldly existence; we are the passengers, show us the other shore.' This poignant plea, found within Chapter 1, encapsulates the essential function of the Sadguru: to guide devotees safely across the turbulent 'ocean of worldly existence.' The author reinforces the significance of this relationship by noting that attaining the feet of such a Guru is a result of merit earned in past lives, highlighting the precious and sought-after nature of Sai's guidance.