Can you elaborate on the concept of the 'knowledge-sacrifice' or 'Jnana-yajna' as described in the text?

The 'knowledge-sacrifice' (Jnana-yajna) is a profound internal process for burning away ignorance, as detailed in Chapter 50. This is not a physical ritual but a metaphorical one where the realization 'I am Brahman' serves as the sacrificial post. The five great elements form the canopy, while the perceived difference between the individual soul and God is the sacrificial animal. The five senses and five pranas are the materials, and the fire of knowledge is kindled in the sacrificial pits of the mind and intellect. The Jiva, acting as the sacrificer, offers the 'ghee of ignorance' as an oblation. This act of offering up ignorance fuels the fire of knowledge, which in turn burns away the illusion of duality, leading to the experience of non-dual self-bliss.