Anyone who does not see the vanity of the world is very vain himself.

And so who does not see it, apart from the young who are preoccupied with bustle, distractions, and plans for the future?

But take away their distractions and you will see them wither from boredom.

Then they feel their hollowness without understanding it, because it is indeed depressing to be in a state of unbearable sadness as soon as you are reduced to contemplating yourself, and without distraction from doing so.

—Pascal, Penseés 70 (tr. Honor Levi)