Ecclesiastes 2:19; Ecclesiastes 7:17; Ecclesiastes 10:3; Ecclesiastes 10:14

19 And who knoweth whether he shall be a wise man or a fool? yet shall he have rule over all my labour wherein I have laboured, and wherein I have shewed myself wise under the sun. This is also vanity.

17 Be not over much wicked, neither be thou foolish: why shouldest thou die before thy time?

3 Yea also, when he that is a fool walketh by the way, his wisdom faileth him, and he saith to every one that he is a fool.

14 A fool also is full of words: a man cannot tell what shall be; and what shall be after him, who can tell him?