The most valuable resource that we all have is time.  It’s valuable because with time we invest into what we hold valuable.  If we think that we need leisure, we will invest our time, however much we think we have left, into entertainment or sport.  If we think that being productive is important, we will spend our time working to financially secure our families as well as providing a service for our companies.  But the thing about investing our time is we never really know how much we have left.  Imagine you are trying to invest your money for retirement, but you are not sure of how long you will be getting a paycheck from your job.  You do the best you can to prepare for the future, but you have to keep in the back of your mind that the retirement day may never come.  

When it comes to spiritual things this fact remains true as well.  We need to plan like there will be a long future ahead of us, but also remember that future is not promised to us.  

David put it this way in Psalm 39:4-6, “O Lord, make me know my end and what is the measure of my days; let me know how fleeting I am! Behold, you have made my days a few handbreadths, and my lifetime is as nothing before you. Surely all mankind stands as a mere breath! Surely a man goes about as a shadow! Surely for nothing they are in turmoil; man heaps up wealth and does not know who will gather.”

Let’s not forget that God has numbered our days and we need to be ready at any moment to leave this world.  We don’t like facing this reality, but we need to live ready to go to heaven when we are called home.