Based on the text, how do Maya, the Guru's grace, and the realization of Knowledge interact?

Chapter 39 describes the entire visible world as a play of the indescribable Maya, which is equated with unmanifest Nescience (Avidya) or Ignorance. This Maya creates the delusion of duality and covers the self-existent Knowledge. The text emphasizes that Knowledge is not something to be achieved but is already present. The key to piercing this veil of Maya is the Guru's grace, which can be earned through means like prostration, questioning, and service. The Guru's grace is described as an 'ointment' that, when applied, causes the 'veil of Maya' to fly away, allowing the natural Knowledge of the Self to be revealed.