How does Chapter 51 use the Bhagavad Gita to explain the concept of overcoming delusion?

Chapter 51 provides a nuanced explanation of spiritual progress by referencing the Bhagavad Gita. It highlights the conversation where Shri Krishna asks Arjuna if his delusion has been destroyed, not if he has attained knowledge. In response, Arjuna confirms, "My delusion has vanished." As Chapter 51 points out, this distinction is significant because it frames enlightenment as the removal of ignorance (moha) rather than the acquisition of something new. The text further clarifies that delusion and ignorance are just different words for the same thing, and understanding this is key to grasping the Gita's essence.