“Fear of death” or the instinct to protect the physical body. It is one of the five kleshas (causes of suffering). According to the Yoga Sutrasof Patanjali (2:9): Abhinivesha is sustained by its own empirical experiences; it affects even the learned.” Patanjali says that this klesha is present even in learned people, which means it cannot be transcended by mere intellectual understanding or knowledge derived from studying scriptures and comparing doctrinal views. Read more.