In Psalm 90:12 that wise man was inspired to write, "Teach us to number our days that we may get a heart of wisdom." Such a simple concept: Oh, Lord, cause to understand how fleeting this mortal life is, so that we can attend to the most important thing, knowing You. For, according to Proverbs 9:10, "The fear of the LORD is the beginning of wisdom, and the knowledge of the Holy One is insight." That man,
What strikes me about this is the contrast to our modern attitude. Today, our expected life span is a little shy of eighty years, a third less than Moses experienced. And in those years, we contemplate things such as the distance to the nearest stars, a distance which even light requires years to traverse. Yet, it isn't enough time for so many to contemplate that eternity is approaching, and it is their relationship with Jesus Christ, or lack thereof, which will determine what kind of eternity they will have.
Some people give us the knowledge of amazing things - of supernovas, of tyrannosaurs, of particles of matter so small that they pass through us continuously without any awareness on our part. Yet, there is no distance so far, or predator so fierce, or neutrino so small, that it can stir in so many hearts an awareness of the God who made them all, and before whom, someday, we will stand to be judged.
Truly, Lord, make us conscious of the fleeting nature of life, and the length of eternity that follows, that we may make our hearts right with You.