Based on the commentary in Chapter 51, what is the subtle but significant difference between Arjuna's statement, 'this delusion of mine has vanished,' and a potential claim of 'attaining knowledge'?

Chapter 51 presents a sophisticated analysis of Arjuna's spiritual realization. It emphasizes that Arjuna's declaration, 'My delusion has vanished,' is profoundly different from claiming to have 'attained knowledge.' The chapter explains that 'delusion' (moha) and 'ignorance' are synonymous. Therefore, the destruction of delusion signifies the removal of a negative state—the veil of ignorance. This is contrasted with the act of 'attaining knowledge,' which could imply an intellectual acquisition. As interpreted within Chapter 51, the true essence of spiritual progress, as demonstrated by Arjuna, lies in purification and the clearing away of ignorance, not in the accumulation of information.