Can you explain the philosophical distinction between oneness and duality as presented in Chapter 14, and how one can transcend duality?

In Chapter 14, a profound philosophical teaching on oneness (non-duality) versus duality is presented. It posits that the intellect which establishes duality, or manifoldness, is pure ignorance, and clinging to it results in the endless cycle of birth and death. Oneness is achieved by recognizing that the same Essence in one's own body is present throughout the entire universe. The text teaches that to transcend duality, one must turn away from this ignorance through the Guru's teachings, which purify the mind. By surrendering to this universal Essence and ceasing to perceive differences, one attains their true nature, which is a state of non-duality where everything is seen as Brahman.