Begin by reading and reflecting on Philippians 1:20-26.
…Consider that God has ordered your days. He has given you a certain number of days to use for his glory and the good of those around you. What are you doing with the time you have?
Remember, we are not talking about the time you think you have, but the time you actually have. If you knew for certain that this was in fact the last day of your life, what would you do? Would you hole up in your house, kneeling, repenting for all the sin you have neglected? Would you run to every friend and relative who does not know Christ and encourage them to repent and believe the gospel?
But while today could be your last, you do not know it, so the best course of action is simply to be faithful to the things God has called you to this day, for it could be your last. Will you love your spouse? Talk with your kids? Do your best at your place of employment? Pray and seek God with earnestness and sincerity?
You see, you have to make the most, not just of the day as a whole, but of all the parts that make up that day. That is your responsibility. Live short; live with urgency. This is the natural outworking of truly embracing our chief end of glorifying God and enjoying him forever.
Taken from Chap.26 “Live Short” (found in Part Two, “The Gospel and Others”) in Note to Self: The Discipline of Preaching to Yourself by Joe Thorn (Crossway, 2011), pp.89-90.