To live wisely, we must recognize that there are two fundamental truths of a human life. The first is that we have a limited and undefined amount of time — it may be 100 years, it may be 30. The second is that in that limited and undefined amount of time we have an almost unlimited number of choices of how to use our time — the things we choose to focus on and put our energy into — and these choices will ultimately define our lives.
When we are born there is no owner’s manual provided, and the clock begins ticking the moment we arrive. We do not like the words “die” and “death.” Many human activities are designed to shield us from the truth about life; that it is limited, that at least here in this place, we do not have forever. Still, it is the fact that we die and that our time is limited that makes discovering the secrets to life important. If we lived forever, there would be little urgency to discover the true paths to happiness and purpose since given the luxury of eternity we would surely stumble on them sooner or later. This is a luxury we do not have.
John Izzo, The Five Secrets you must Discover before Your Die