What is the relationship between ignorance, duality, and the knowledge of oneness as explained in the text?

The philosophical teachings in Chapter 14 draw a direct line between these concepts. The intellect that establishes duality is explicitly identified as pure ignorance. This ignorance, along with delusion, causes the mind to get stuck in perceiving differences, which perpetuates the cycle of birth and death. The knowledge of oneness is the remedy. By turning away from ignorance through the Guru's teachings, the mind is purified, leading to a state of non-duality. One must completely abandon duality to become peaceful and realize the single essence of Brahman everywhere.