What is the significance of the Bhagavad Gita verse and the 'Avagraha' mentioned in Chapter 50?

In Chapter 50, the author introduces a verse from the fourth chapter of the Bhagavad Gita, "Tadviddhi pranipatena pariprasnena sevaya...", to make a subtle philosophical point about knowledge and ignorance. The significance lies in a unique interpretation of the verse's third line. The author points out that an 'Avagraha,' a specific symbol in Sanskrit, can emerge before the word 'Jnana' (knowledge). This Avagraha acts as an indicator of 'Ajnana' (ignorance). This interpretation suggests that the instruction being given in the verse could be oriented toward dispelling ignorance, not just imparting knowledge. It's a sophisticated analysis used to deepen the discourse on how easily knowledge can be misunderstood or intertwined with its opposite, underscoring the need for a Guru and pure understanding.