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

2 It is useless, useless, said the Philosopher. Life is useless, all useless. 3 You spend your life working, laboring, and what do you have to show for it?
14 I have seen everything done in this world, and I tell you, it is all useless. It is like chasing the wind.
17 I was determined to learn the difference between knowledge and foolishness, wisdom and madness. But I found out that I might as well be chasing the wind.