What philosophical points does Chapter 20 make about the nature of the Guru and the path to Self-knowledge?

Chapter 20 presents a profound philosophical perspective on the Guru's role and the attainment of spiritual wisdom. The text states that Sai, though 'originally formless,' took on a physical form for the sake of his devotees, much like an actor. Furthermore, Chapter 20 strongly emphasizes that grasping the deep, hidden truths of scriptures like the Upanishads is impossible without the Guru's grace. The chapter explicitly claims that a scholar who relies solely on their own intellect will not succeed, because without the Guru's blessing, 'the hidden truth does not come to hand.' For the humble devotee attached to the Guru's feet, however, this 'science of Self-knowledge' opens up automatically.