Chapter 20 discusses the difficulty of understanding scriptures like the Upanishads. What is the chapter's core teaching on the necessity of a Guru for spiritual understanding?

Chapter 20 of the Sai Satcharitra emphasizes that grasping the profound spiritual truths within scriptures like the Upanishads is nearly impossible without a Guru's grace. The text states that the Upanishads contain the essence of the Vedas, but their hidden meanings are difficult to access. It explicitly refutes the idea that a scholar can comprehend these truths through their own efforts, stating that this will not happen even at the end of an era without a Guru's guidance. As the chapter explains, the path is difficult at every step for the unaided. However, for one who is attached to the Guru's feet, the hidden meaning opens up automatically.