Can you explain the concept of the Self as being 'Unqualified' (Nirguna) and beyond existence?

The teachings in Chapter 37 describe the Self in profound, transcendental terms. It is said to be free from the very notions of existence and non-existence, placing it beyond our limited intellectual categories. This true essence, the Self, is devoid of all specific qualities; it is beyond old age, birth, and death. It is described as ancient, eternal, unborn, indivisible, and changeless, all-pervading like the sky. The text specifically warns practitioners not to mistake this 'Unqualified' (Nirguna) nature as being invisible or non-existent out of ignorance. Instead, this ignorance must be driven away through knowledge, and the Self should never be considered a 'void'.