Ecclesiastes 2:19
2:19 Who knows if he will be a wise man or a fool?
Yet he will be master over all the fruit of my labor
for which I worked so wisely on earth!
This also is futile!
Ecclesiastes 3:21
3:21 Who really knows if the human spirit ascends upward,
and the animal’s spirit descends into the earth?
Ecclesiastes 8:1
Human Government Demonstrates Limitations of Wisdom
8:1 Who is a wise person? Who knows the solution to a problem?
A person’s wisdom brightens his appearance, and softens his harsh countenance.