How does Chapter 12 explain the role of a Sadguru in helping a soul overcome worldly existence and duality?

In Chapter 12, a Sadguru is described as an 'embodiment of Truth, Consciousness, and Bliss' who stills the 'waves of worldly existence.' The text explains that through the knowledge of non-duality, a Sadguru can remove the obsession with duality even from the dull-witted. Saints are metaphorically called the 'Agastya for the ocean of worldly existence,' referencing the sage who drank the ocean, signifying their ability to help devotees overcome the vast challenges of life. They are also called the 'sun for the darkness of ignorance.' Chapter 12 asserts that the Supreme Soul resides within them, making them a direct means for a devotee to transcend worldly fears and achieve liberation.