How does the concept of duality contribute to fear, and what is the prescribed method to overcome it?

According to the teachings in Chapter 37, duality is the very entry point for fear. The text explicitly states, "Where there is an obsession with duality, there fear enters." This perception of duality, or manifoldness, stems from ignorance (Avidya). To counteract this, one must acquire knowledge (Vidya) through the scriptures and the guidance of a Guru. The ultimate solution is to serve the non-distinguished state and hold firmly to the Guru's feet. This practice helps one attain a non-dual intellect, which dissolves the perception of difference and, consequently, eliminates the root of all fear.