Analyze the metaphysical concepts presented in Chapter 20 regarding Sai Baba's true nature and the path to Self-knowledge.

Chapter 20 delves into profound metaphysical ideas, presenting Sai Baba as being 'originally formless' but having taken a physical form for the benefit of his devotees. The text likens this manifestation to an actor playing the role of 'Maya,' aligning with the Vedantic concept of the divine assuming form to guide humanity. Furthermore, the chapter discusses the path to Self-knowledge, which it terms 'a weapon that cuts through birth and death.' It emphasizes that this ultimate knowledge is not attainable through mere scholarship. As stated in Chapter 20, without a Guru's grace, the 'hidden truth does not come to hand.' Only those who are humble, detached, and attached to the Guru's feet are deemed worthy, as the profound meanings of scriptures will then open up to them automatically.