Answer: No matter how much man chases after things, at the end of life, everything is left behind.
Explanation:
All is vanity is an expression that implies that no matter the amount of things acquired by man, all will fade away.
The world evolves and there are times and seasons to things. Something could be very much craved for an after a season in life, becomes stale. Also, the desire for things acquired, fades away after acquiring what was so desired one after another.
At the end of life as well, nothing acquired by a man doesn't get left behind. Therefore, making everyday count, while being aware that one's mind should not be driven by an obsessive need for acquisition is key.