" Our deep irrational feelings of death anxiety have been attributed to multiple sources. In part, they may arise from evolved self-protection mechanisms or survival responses of being a victim of predators. They might, conversely, stem from unconscious fear (or guilt) of retribution resulting from our own acts of harming or predation. According to existential psychologists, the most powerful form of death anxiety comes from our general ability to anticipate the future, coupled with conscious anticipation of inevitable personal demise. "

― , Ecology and Experience: Reflections from a Human Ecological Perspective