What is the nature of the Self as described by Sai Baba, and how should one perceive the 'Unqualified' (Nirguna)?

In Chapter 37, the Self is described as being devoid of all specific qualities, existing beyond birth, death, and old age. It is eternal, ancient, unborn, and all-pervading like the sky. The text emphasizes that it is beginningless, indivisible, and changeless. Crucially, we are warned not to mistake this 'Unqualified' or Nirguna nature as being non-existent or a void due to ignorance. Instead, one must drive away this ignorance through knowledge. The true essence, the Self, is free from the notions of existence and non-existence and is described as the all-pervading form of the Guru.