Ecclesiastes 1:18; Ecclesiastes 5:3; Ecclesiastes 5:7; Ecclesiastes 11:1

18 Because in much wisdom there is much grief, and increasing knowledge results in increasing pain.
3 For the dream comes through much effort and the voice of a fool through many words.
7 For in many dreams and in many words there is emptiness. Rather, fear God.
1 Cast your bread on the surface of the waters, for you will find it after many days.