We must remember that our life here on earth is just a temporal passage towards an eternal existence in another life which would constitute either the reward or punishment, depending on how we lived our existence on this earth. Nobody doubts this life is temporal and passing since we can see that by our own observation of life here on earth that there is an end to it, no doubt about that. The mere fact that there are funerals and burial places proves that. We just have to follow what the Holy Bible tells us that our lives must follow God’s laws so we may be granted God’s eternal reward and felicity for our good behavior in our temporal lives on earth.
You can observe from the circumstances of people and things around us that everything passes away with time. In the Holy Bible you can read in the book of Ecclesiastes: “There is a season for everything, a time for every occupation under heaven: a time for giving birth, a time for dying, a time for planting, a time for uprooting what has been planted” (Eccles.. 3:1-2).