Psalm 49:12 Nevertheless man being in honour abideth not: He is like the beasts that perish. 13 This their way is their folly: Yet their posterity approve their sayings. Selah.
Men live for their honor. They think that they can make something of themselves. They strive to enjoy life that is worth something and that accomplishes something.
Men never last. They die just like animals. We waste our lives on things that have no real value and our children are foolish enough to think that what we do really matters.
The only way that you can make a difference and have anything that lasts is to do something for God. He alone makes our lives count for anything.