Can you explain the concept of the 'Unqualified' (Nirguna) Self as described in the text? What are its characteristics?

Chapter 37 provides a profound description of the true nature of the Self. It is described as being beyond the dualistic concepts of 'existence' and 'non-existence,' and is free from all specific qualities and signs. The Self is devoid of old age, birth, and death; it is ancient, eternal, and always free from decay. The text further elaborates that the Self is all-pervading like the sky, beginningless, indivisible, and changeless. It is without sound, form, taste, or smell. Critically, the chapter warns against mistaking this 'Unqualified' (Nirguna) nature for non-existence or a void out of ignorance, emphasizing that this ignorance must be driven away through knowledge.