What is the 'Unmanifest' and what is its relationship to ignorance and liberation?

The 'Unmanifest' (Avyakruta), as detailed in Chapter 50, is described as the causal body of the soul. It is characterized by the reflection of consciousness and is considered the very cause of pure ignorance. The text explains that this ignorance of the Soul is the source of the Unmanifest. Liberation, or Moksha, is defined as 'abiding in one's own form,' and this can only be achieved through the removal of this causal body. This removal, in turn, is only possible through the knowledge of the unity of Brahman and the Soul, which eradicates the ignorance at its root.