What you have done today and would it bother  you when death comes? What would you do if find out that you have only one year left to live? What are you going to do then, what thing would you want to achieve? What would you want to see or to feel? Who would you ask for an apologie or whom would you want help? What would you have left after you pass away? Do you think you may leave something worthy to remember? 
What if you will die within a month? Or a day?  Or one hour? What if you have only time left as much as one match burning? 

Life is short and death is always waits us in the end.  Time is the most valuable thing: wasted minuted is gone forver and your life has gotten shorter. Don't burn your time for nothing! Remember about death, because only death can bring sense and meaning to life.