Eternity is a word that refers to a time line that does not end. The bible promises that if you lead a good life then your reward will be an eternity in heaven, but if you are an evil person you will burn in hell for eternity. There is no end to eternity, it just keeps going on forever. Many believe that they will spend an eternity with loved ones who have passed away once they die, and that these loved ones welcome the soul when death happens.