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 essentially means separation from something or someone.
It implies loneliness. Man begins life separated from God and therefore spiritually dead because of his sin. Apart from a personal relationship with God and commitment to him, man is spiritually dead and very much alone. This is eternal, irreversible separation from God. Anyone who refuses to commit his life to Jesus Christ will experience this eternal death.