Death may catch up with you at any time. Who knows, perhaps this is the moment. Or, it may be much closer than you have ever expected. These lines may be the last opportunity, the last reminder, the last warning before death comes upon you. As you proceed with these lines, you can never know that you will still be alive in the next hour. Even if it proves to be so, nothing can guarantee you another hour. Let alone an hour, not even after a single moment, is it certain that you will be still living. There is no guarantee that you will ever finish reading this book. Death will, most likely, come upon you at a time when, only a moment before, you never thought about dying. You will most certainly die, as will all your loved ones. Before you or after you, they will certainly die. A hundred years from now, there will not be a single soul you are familiar with in this world.