What is liberation or 'Moksha' and what is the specific path to achieving it according to this text?

In Chapter 50, liberation, or 'Moksha', is defined very clearly as 'abiding in one's own form.' It is the state of returning to and resting in one's true nature as the Soul. The text explicitly states that there is no other form of liberation. The specific and only path to achieving this state is through gaining the 'knowledge of the unity of Brahman and the Soul.' This singular understanding is what has the power to remove the 'causal body,' which is born from ignorance (Avidya). Once this ignorance is dispelled by knowledge, the soul is freed and abides in its own form, which is Moksha.