Ecclesiastes 1:17; Ecclesiastes 2:22; Ecclesiastes 4:16

Ecclesiastes 1:17

17 And I set my mind to know wisdom and to know madness and folly; I realized that this also is striving after wind.

Ecclesiastes 2:22

22 For what does a man get in all his labor and in his striving with which he labors under the sun?

Ecclesiastes 4:16

16 There is no end to all the people, to all who were before them, and even the ones who will come later will not be happy with him, for this too is vanity and striving after wind.