Therefore we do not lose heart. Though outwardly we are wasting away, yet inwardly we are being renewed day by day. For our light and momentary troubles are achieving for us an eternal glory that far outweighs them all. So we fix our eyes not on what is seen, but on what is unseen. For what is seen is temporary, but what is unseen is eternal. (2 Corinthians 4:16-18)
When you are young, death seems like something reserved for the unlucky in combat or a parachute jump. But the older you get the more the reality of such a fate begins to soak in. Then the big reach for significance begins to take over; a reach for promotion, power, material goods, and anything that would satisfy the yearning to be somebody who has done something. But unless we invest in the eternal, we simply toss it all to the wind. Fix your eyes on the eternal.