Eschatological verification describes a case where a statement can be verifiable if true but not falsifiable if false. The term is most commonly used in relation to God and the afterlife.
John Hick has expressed the premise as an allegory of a quest to a Celestial City. In this parable, a theist and an atheist are both walking down the same road. The theist believes there is a destination, the atheist believes there is not. If they reach the destination, the theist will have been proven right, however if there is no destination on an endless road, this can never be verified. This is an attempt to explain how a theist expects some form of life or existence after death and an atheist does not. They both have separate belief systems and live life accordingly, but logically one is right and the other is not. If the theist is right, he will be proven so when he arrives in the afterlife. However, if the atheist is right, they will simply both be dead and nothing will be verified.