How is liberation, or Moksha, defined and achieved according to this philosophy?

The explanation in Chapter 50 defines liberation (Moksha) in a very specific and absolute way: it is simply "abiding in one's own form." The text emphasizes that there is no other liberation besides this. The sole method for achieving this state is through the attainment of the knowledge of the unity of Brahman and the Soul. This profound realization is what causes the removal of the causal body, which is rooted in pure ignorance (Avidya). Therefore, Moksha is not an external goal to be reached but an internal state to be realized by dispelling the ignorance that veils one's true nature.