Reminding ourselves each day that we will die helps us treat our time as a gift. Someone on a deadline doesn’t indulge himself with attempts at the impossible, he doesn’t waste time complaining about how he’d like things to be. They figure out what they need to do and do it, fitting in as much as possible before the clock expires. They figure out how, when that moment strikes, to say, Of course, I would have liked to last a little longer, but I made a lot of out what I was already given so this works too.