What is the primary cause of our fear of worldly existence, and how can we overcome it, especially the fear of death?

The source text explains that the root cause of all worldly fear, including the great fear of death, is ignorance (Avidya). This ignorance establishes a perception of manifoldness and duality, which inevitably leads to fear. Chapter 37 clarifies that to become fearless, one must surrender completely to the Satguru—with body, speech, mind, and intellect. By holding firmly to the Guru's feet, He grants the non-dual intellect, which eliminates the obsession with duality where fear resides. When the Guru is there to remove all worries, the text asks, why should one worry about the world?