What is Sai Baba's core teaching on the nature of Knowledge versus Ignorance?

Sai Baba explains that Knowledge (Jnana) is not something that can be taught or described with words, as it is self-existent and beyond speech. In Chapter 39, He clarifies that what is truly taught is the nature of Ignorance (Ajnana). Ignorance acts as a veil covering the ever-present Knowledge, much like ash covers a fire or dust covers a mirror. The purpose of spiritual instruction is not to create Knowledge, but to remove the covering of Ignorance. Once this veil is removed, Knowledge, which is our true nature, shines forth naturally without any further effort.