Eternity is a long period of time! It’s hard to grasp   that eternity is never-ending. But let me give you a little illustration to   help you understand. Imagine that we could empty the largest body of water in   the world, the Pacific Ocean, and fill it up with sand as tall as the highest   mountain in the world, Mount Everest. Now imagine that a bird flies by and   takes one grain of sand off that sand pile once every 100 billion years. How   long will it take for that sand pile to disappear? We can consider that   amount of time to…