What does the text say about the 'Unmanifest' or causal body, and how can one achieve liberation from it?

According to Chapter 50, the 'Unmanifest' (Avyakruta) is also known as the causal (karana) body of the soul. It is described as being with the reflection of consciousness and the cause of pure ignorance. The text notes that the ignorance of the Soul is the reason for this body's existence. True liberation, or Moksha, is defined as abiding in one's own true form. This state can only be achieved through the removal of this causal body, which, as the scripture clarifies, is only possible through the attainment of knowledge of the unity of Brahman and the Soul. This knowledge is what ultimately removes the ignorance.