As long as a feeling of separation subsists, there is always going to be dualism. That which is separate stands apart, therefore can always be lost. Hence, fear will always exist where there is duality. We are born with the precondition that I am my body, and I am my mind, or I am form. Form is constantly breaking down and decaying, so we feel “I am” decaying. The body malfunctions and thoughts of who I am, my beliefs, demands, and mental positions; are increasingly challenged over time.
Here, we are cut off from the realization of our eternal nature and completely identified with the process of decay. Therefore, we suffer with fear believing we are going to lose our life (body and mind) at some point.
This base-line illusion of separation between the transient and the eternal is the root of all fear. Therefore, the only way to be free from fear once and for all, would be to experientially exist in spite of mind and body without a second of doubt.
Inquiry into this notion puts a seeker in proximity to their eternal nature, which is intuited but remains elusive. This intuition is enough to establish a deep reverence and love for It as worship being the proper function of duality; which then finally pulls down the grace that solves the riddle of the oneness between the transient and the eternal; destroying all separation forever.