What is the philosophical significance of the Guru according to Chapter 10 of the Sai Satcharitra?

Chapter 10 presents the Guru as the supreme spiritual reality, stating that "all other gods are illusory; the Guru alone is the one eternal God." The text posits that remembering and serving the Guru is the most effective and accessible spiritual practice (Sadhana), one that costs nothing yet yields great fruit and unties the knot of birth and death. This path of devotion to the Sadguru is shown to bypass the need for complex intellectual or logical debates. The Guru is metaphorically a "boatman" who, upon seeing a devotee's faith, grants them divine Knowledge (Samvitti) and liberation (Moksha), leading them across the ocean of existence to a state of bliss.