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

2 "Everything is meaningless," says the Teacher, "utterly meaningless!" 3 What do people get for all their hard work?
14 Everything under the sun is meaningless, like chasing the wind.
17 So I worked hard to distinguish wisdom from foolishness. But now I realize that even this was like chasing the wind.