What does Chapter 50 say about the concept of 'Avagraha' in the Bhagavad Gita and its relation to knowledge and ignorance?

Chapter 50 delves into a specific verse from the Bhagavad Gita (4.34) to discuss a subtle point about knowledge. It explains that in the third line of this verse, an 'Avagraha' (a linguistic symbol) can appear before the word 'Jnana' (knowledge), which serves as an indicator of 'Ajnana' (ignorance). While the straightforward meaning of 'Jnana' is acceptable, this interpretation highlights a deeper layer. As detailed in Chapter 50, this 'Avagraha' concept is used to introduce the idea that what might appear as knowledge can sometimes be clouded by ignorance, which requires careful spiritual discernment to understand.