In Christian theology, conditionalism or conditional immortality is a concept in which the gift of immortality is attached to (conditional upon) belief in Jesus Christ. This doctrine is based in part upon another biblical argument, that the human soul is naturally mortal, immortality ("eternal life") is therefore granted by God as a gift. This viewpoint stands in contrast to the more popular doctrine of the "natural immortality" of the soul. Conditionalism is practically synonymous with annihilationism, the belief that the unsaved will be ultimately destroyed, rather than suffer unending physical torment in hell. The view is also sometimes connected with the idea of soul sleep, in which the dead sleep unconscious until the Resurrection of the Dead to stand for a Last Judgment before the World to Come.