The text mentions something called 'Avagraha' in a Gita verse. What is that and what is its significance in understanding knowledge vs. ignorance?

In Chapter 50, the text analyzes a verse from the Bhagavad Gita (4.34) to discuss the concepts of knowledge and ignorance. It points out that an 'Avagraha' appearing before the word 'Jnana' (knowledge) acts as an indicator of 'Ajnana' (ignorance). This subtle observation is used to launch a deeper philosophical discourse. The text argues that one must first understand and remove 'Ajnana,' or ignorance, to purify the mind. Only after this purification can infinite 'Jnana,' or true knowledge, manifest itself, leading to non-dual Samadhi. The 'Avagraha' thus serves as a key to unlocking the discussion on the prerequisite of removing ignorance before attaining knowledge.