The Bible recognizes the inevitability of physical death. In a sense, everyone is terminally ill. Unless Christ returns in our lifetime, our pilgrimage through this world will end in death. Physically, death is the most stubborn and persistent enemy of humanity. But it is not the most dangerous foe.
Death basically means separation from something or someone.
It implies loneliness. A person begins life separated from God and spiritually dead because of his or her sin. Apart from a personal relationship with God and commitment to Him, every human being is spiritually dead and very much alone. Anyone who refuses to commit one's life to Jesus Christ during his or her lifetime here on earth will experience this eternal death. Physical death, clearly, is not the end of our existence.