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

Ecclesiastes 2:19

19 And who knows whether he will be a wise man or a fool? Yet he will have control over all the fruit of my labor for which I have labored by acting wisely under the sun. This too is vanity.

Ecclesiastes 7:17

17 Do not be excessively wicked and do not be a fool. Why should you die before your time?

Ecclesiastes 10:3

3 Even when the fool walks along the road, his sense is lacking and he demonstrates to everyone that he is a fool.

Ecclesiastes 10:14

14 Yet the fool multiplies words. No man knows what will happen, and who can tell him what will come after him?