Ecclesiastes 1:2-3; Ecclesiastes 1:14; Ecclesiastes 1:17

2 "Meaningless! Meaningless!" says the Teacher. "Utterly meaningless! Everything is meaningless." 3 What does man gain from all his labor at which he toils under the sun?
14 I have seen all the things that are done under the sun; all of them are meaningless, a chasing after the wind.
17 Then I applied myself to the understanding of wisdom, and also of madness and folly, but I learned that this, too, is a chasing after the wind.